Well done sir. Clean looking N/A car. too bad it is too far north.... lol
Posted 25 April 2015 - 06:33 PM
Cheers texas30O, appreciate it!
Nice sunny day today, so I thought I'd attempt to perform my first valve adjustment. Never done one before, but read up on it and it seems simple enough, just a little fiddly. Popped off the valve cover, seems the threads on 3 of the allen bolt holes are partially stripped... joy... anyway, that's a problem for another day. Pulled the plugs, all looked fine there.
Took the opportunity to set the engine to TDC and check that the crank and cam timing at in sync. The marks lined up perfectly, nice! My 60-2 trigger wheel for the Electromotive HPV-1 was also correctly aligned with the magnetic pickup on the 11th tooth from the -2, so I know my timing should be accurate, which is great.
I did the valves in pairs, turning the camshaft to the next pair as needed. Almost all of them were out of spec by 1-2 thousands, and one was out by 4 thousands. Adjusted the intakes to 0.008" and the exhaust to 0.010", per the cold specs.
Threw it all back together, and the engine is now running noticeably smoother. The wideband gauge is much more steady as well, whereas before it had some wild swings going on.
Tomorrow I'll be pulling the 44's, to give them a check over and clean up. While I am at it, I am going to play around with the heatshield I made - reckon I can bend up the back of it a touch to gain better header clearance.
Edited by ryant67, 25 April 2015 - 06:34 PM.
Posted 07 May 2015 - 05:16 AM
Had the Z in with my mechanic as it was leaking a fair bit of oil and he suspected the rear main seal. While he was in there replacing it, he found a spun bearing. More money I guess. On a positive note, we did confirm that my engine was indeed a stroker with the V07 crank - hopefully it's undamaged. Heading back up there later today to tear some parts off the engine, to make it easier for him to pull it. Will be interesting to see what's all in the engine, rod/piston wise, etc.
Time to read up some more on engines...
Posted 08 May 2015 - 05:57 PM
Trying not to go too crazy with the rebuild here, but since I am already running L24 rods and have a LD28 crankshaft, I guess I might as well take things a step further.
At the moment I am thinking of going with the following:
E31 head - already ported and polished with enlarged valves (have)
Isky cam - thinking stage III?
F54 block (have)
L24 rods (have)
LZ24 pistons - 89mm
LD28 crankshaft (have)
1mm head gasket
Misc other items I also have:
9qt oil pan
Centerforce II clutch
So, when it comes to pistons, are there any specific brands to seek out or avoid? Presumably actual Nissan ones would be best, but I haven't been able to find any online so far. Same question for piston rings I guess - I think I have read that ITM do the job just fine?
I'll be shopping around this week for a decent machine shop to do the rod/crank balancing and engine boring. I know quite a few serious autocrossers, so it shouldn't be too difficult.
Ultimately all of the above should leave me with roughly 9.5 compression ratio on a 3.1L stroker. I was running a 3.0 stroker with what I suspect to have been very low compression (never had any ping, no matter how far I advanced the timing), and an unknown camshaft regrind, which I suspect was very mild. Looking for a bit more grunt here - I drive the car purely for fun, hitting country roads and occasional track days.
Any thoughts are more than welcome!
Posted 17 May 2015 - 08:35 PM
DSC04334 by ryant67, on Flickr
While the engine is out, I will be repainting the engine bay and tidying the wiring and such up quite a bit. Lots of little brackets and such to POR-15 up too.
Here is how the head looks, since it's now pulled. Thankfully the valves have already been switched over to the larger L28 ones, and some head work appears to have been done.
DSC04338 by ryant67, on Flickr
Should be hearing from the machine shop this week, and once I know the status of my short block, I can get things rolling. The sooner the better too, since I am obsessing over details way too much already, idle hands...
Posted 02 June 2015 - 07:55 PM
Bought a fully built engine over the weekend. Was going to build another stroker, but it's Summer and I want this thing back on the road ASAP... besides, rushing a serious engine build is probably not the best of ideas, so the stroker can wait... for now.
I'll be switching to a well built L28 with flat top pistons and a ported N42 head, running about 9.5:1 compression with a 1.5mm thick Kameari head gasket. It currently has a pretty mild Crane camshaft in it. I am planning to run it as-is for now, but since I do have my E31 sitting here I am tempted to slap a more aggressive Isky cam into that, switch to a 1mm head gasket, and shoot for 10:1 compression with some valve reliefs cut into the pistons. Could work well, and the quench from the flat pistons and E31 head should keep detonation from happening.
Anyway, that's all speculative since I don't pick up the engine for another week or two. For now my attention has turned to having the engine bay sitting perfect and ready for that new engine. The paint on the body of the car looks pretty great still, and the underside is solid, but the engine bay is looking pretty sorry. Quite sure this is still the original paint, and I have a little bit of battery area rust going - now is the perfect time to take care of this.
Stripping everything out of the engine bay now, but still have to do the area by the master cylinder. I'm shopping the repaint out to a local shop, I know my limits and want this done properly. It will be getting painted white to match the rest of the car.
Posted 03 June 2015 - 05:46 PM
The frame rails are rock solid, which is good. Thankfully the rust by the battery tray doesn't seem to go too deep either, just surface stuff.
Excited to see how it turns out. Big re-wire job is next up. Did a re-wire last year, learned a lot in the process too, but I think I can do a much better job this time - especially with no engine in there!
Posted 04 June 2015 - 06:58 PM
Checking over things from the old engine, killing time in limbo...
My E31 head:
DSC04427 by ryant67, on Flickr
At the very least, those old aluminum valve retainers will be needing replaced.
DSC04432 by ryant67, on Flickr
The camshaft has obviously been reground, but there is no stamping on it besides the factory "K". Mystery cam! The car was pulling very hard from around 4k rpm up to red line at 7k rpm. I set the rev limiter to 7k rpm due to the unknown internals, but this thing wanted to keep going at 7k...
Measuring the lift with vernier calipers:
Find the smallest lobe measurement
DSC04430 by ryant67, on Flickr
Then the largest lobe measurement
DSC04429 by ryant67, on Flickr
So 1.5" - 1.15" = 0.350"
Rocker arm ratio on these cars is typically 1.5 I believe, so 0.350 * 1.5 = 0.520 lift.
So that helps explain the powerband a little. Skinny looking lobes though.
Checking on the Centerforce clutch and Fidanza flywheel, all looks pretty good to me, aside from all the oil from my rear crankshaft seal leak - still though, I guess my shifting isn't THAT bad...
DSC04412 by ryant67, on Flickr
DSC04411 by ryant67, on Flickr
DSC04407 by ryant67, on Flickr
DSC04410 by ryant67, on Flickr
DSC04407 by ryant67, on Flickr
Who is Jack?
I measured up the manifold:
Carb side: 44mm
Intake side: 35mm
So the ports all match (for better or worse..)
Probably going to soda blast my Mikuni 44's this weekend in an effort to clean up the outside of the casting. I have a damaged body to test on first, but this method looks simple enough, and the results look spectacular!
Posted 05 June 2015 - 10:25 AM
Looks like you have too many options and it will be hard to choose-not a bad problem I guess. I would think the e31 with 1mm gasket on a stroker will be at the edge of the CR limits. Sounds like you have full spark control so that will be an advantage to control detonation.
Mikuni manifold looks familiar!
9/71 240z. 2.4 -.40 over, balanced. E-88 Bigger SS valves, stage 2, 6x2 header, true dual exhaust. BW t-5 , STI LSD 3.90- triple Mikunis 40mm
Posted 21 June 2015 - 03:34 PM
Not a whole lot of major progress to report. The car is 100% going in for the engine bay repaint on Monday, and I picked up the new engine last weekend.
Right now I am just stuck in decision mode as the new engine had a lot of nice parts that are duplicates of aftermarket goodies my old stroker motor had.
New: Kameari-style cast aluminum oil pan 5.5qt
Old: Custom high capacity baffled oil pan 9qt [x]
New: 123 Ignition programmable distributor
Old: Electromotive HPV-1 crankfired ignition
New: Clifford Research 6-2-1 header w/ 1.5" primaries into 2" exhaust line
Old: MSA 6-1 header with 1.5" primaries into 3" exhaust line
New: SK Racing 40's on a cannon-style manifold
Old: Mikuni 44's on a Mikuni manifold
New: Crane .450 lift 262/272 duration camshaft
Old: Unknown .520ish lift with unknown duration
And duplicates of the same 83 ZX gearboxes, centerforce clutches, and fidanza flywheels - reckon I will just inspect, pick the best condition ones, and sell the spares.
It's a nice problem to have so many good choices when it comes to parts though, and once I sell off the spares I will just about break even on the new engine I bought, huzzah!!!
Posted 21 June 2015 - 04:03 PM
Took it upon myself to improve the aesthetics of my Mikunis. Tried the old sodablast technique and it didn't really do enough for me, so I got ballsy and bead blasted the carb bodies. Following the blasting, I blew them out with compressed air, rinsed the insides out with carb cleaner, then blasted the hell out of them with the high powered water gun at a coin-op car wash before once again blowing them out with compressed air. Pretty sure there are no beads left in these suckers now. Finished them off with some of POR-15's "Glisten PC" to keep the clean finish protected - I wish I was a little less heavy handed with the coatings though, got a couple of minor runs, but on the whole I am pretty satisfied.
DSC04460 by ryant67, on Flickr
DSC04461 by ryant67, on Flickr
DSC04463 by ryant67, on Flickr
DSC04459 by ryant67, on Flickr
Tore down the old stroker engine and now I have 2 V07 cranks in my living room.
DSC04466 by ryant67, on Flickr
Pulled these L24 rods and unknown pistons from the engine too. Dual valve reliefs, hmm...
DSC04470 by ryant67, on Flickr
DSC04469 by ryant67, on Flickr
Some pics of the custom 9qt oil pan from the stroker motor. Quite like it actually, and it's bottom sits perfectly level with the crossmember.
DSC04473 by ryant67, on Flickr
DSC04475 by ryant67, on Flickr
DSC04471 by ryant67, on Flickr
My little hoard of rods and pistons.
DSC04467 by ryant67, on Flickr
Spent a couple of hours trying to straighten up the fins on my Griffin radiator, not a fun job. Tweezers and lots of patience.
DSC04465 by ryant67, on Flickr
Posted 26 June 2015 - 03:36 PM
So good a job that I'm now getting them to repair the cracks in my fiberglass front air dam and repaint it as well.
23 unused holes were welded up. Battery tray was removed, and I'll be putting a battery box behind the passenger seat.
Now to get the harness sorted out and install it in a couple of days time, then the engine.
Posted 26 June 2015 - 11:13 PM
Kind of fluff given my earlier post, but here are some before/after pics.
Posted 27 June 2015 - 11:40 PM
Reworked my engine bay harness today.
- Removed stock alternator wiring as I am running an internally regulated Ford 3G alternator.
- Removed distributor wiring as I am running crank fired ignition.
- Added fused power wire for fan controller.
- Added wires for ignition and accessory relay triggers.
- Added lines for Electromotive HPV-1, cd player, and fuel pump.
- Sleeved wiring in braided nylon (techflex F6) and heat shrinked ends.
All in all, pretty pleased with how it turned out. I just need to sleeve the relayed headlight harness and water temperature gauge line now.
Posted 07 July 2015 - 07:28 PM
Getting close now, just a couple of small odds and ends to finish up, then the engine can be dropped in.
I'll need to fab up a bracket for the bussmann fuse/relay box, mount the bus bar for power connections, and run the wiring for the power and ground wires to the battery behind the passenger seat.
Chomping at the bit to drive this thing again!
Posted 08 July 2015 - 12:16 PM
That's looking fantastic!
PM me for any composites related inquiries.
Posted 14 August 2015 - 03:11 PM
Egads, how time flies!
Engine is in, and running. Just a few odds and ends to zip tie and secure, and some clutch adjustments to be done. Looking pretty good though!
I was pretty bummed out that my AN fitting fuel lines sit too high for the Cusco strut bar, and the T3 triangulation rods to clear. Reckon I can solve that be adding an extra 90 (or 45) degree bend so they angle down again. I'll also be switching to a throttle cable for the carbs, as there really isn't sufficient clearance for the rod by the firewall. Lokar seems to be the way most people do this, so I just need to DIY up a bracket.
Posted 05 September 2015 - 06:03 PM
Some finishing touches:
- Added some 45 degree AN fittings to my fuel lines for the carbs, which lowered things just enough for the Cusco strut brace to clear.
- Installed T3 triangulation bar.
- Hacked off one of the clips on my ITG air filter for clearance.
- Converted to Lokar throttle cable. Made a basic bracket for it that attaches to one of the heatshield support arms at the side of a Mikuni. MUCH improved throttle response now, loving it.
- Re-routed the brake vacuum line to avoid any clearance problems with the throttle linkage. To form the shape I rammed 3/8 copper tubing inside 3/8 rubber line, wasn't easy, but it went. Then I carefully bend the tubing to shape. Brakes still work perfectly, easy job.
- Rerouted the braided fuel line slightly to be more direct.
Not much left to do at this point, just some fine tuning to the carb jetting. Very happy with how things are looking under the hood, and how well the car seems to be running.
Posted 05 September 2015 - 08:17 PM
1972 240z, purchased in 1991 for $900. Bone stock LS2/T56/DBW from 2006 GTO, swap completed in 2011. 400rwhp/435 rwtq. 2400# minus driver. JCI swap, Mantic ER2 clutch kit, JTR headers, single exhaust, Borla muffler, MGW shifter, M2 Differentials shortened Z31 CV axles, Z31 CLSD R200, Chequered Flag Racing billet stubs and companion flanges. MSD 2-step, Hurst roll control, both operated from switches on clutch pedal. 9" Hoosier drag slicks on Weld Draglites, 245/45/16 Hoosier A6/R6 on 16X8+10 Rota RBR. 225/250 sectioned coilovers, Koni 8610-1437RACE shocks, DP and EMI camber plates, MM shortened rear control arms, TTT front control arms, poly and aluminum bushings. Top speeds: Ohio Mile 174mph, C/GMS class record holder, best 1/8 mile 6.96 at 100mph, best 1/4-mile 11.0 at 126mph, best 60' 1.43, best 1/2-mile 148mph at GA 1/2-mile. Home Track-Jake's Dragway, Moulton, AL. SCCA autocross club - TVR, Huntsville, AL. Lets race!
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