yo2001

I guess you are talking about unshrouding the valves. That's a good place to work on. but you can go over more than the bore of the head gasket. So you need to becareful there.

nissan T-25 is ball bearing unit isn't it? Well, it is on SR20DET but that might be T-28 Nissan turbine housing is pretty good. I think compressor can be altered with T4 for more flow. I think SR guys are doing 280zxt turbine housing with T-25 ball bearing compressor unit for more power.

okay, I can scan you the flow sheets and email them to you. I would like to see what you got too.

So changing the compression from 8.3:1 to 8.6:1 give you 10HP? that's only 0.3 different. I doubt that. So if I go from 8.3:1 to 10.3:1 I get 60HP+? That's alot. I was comparing 73 E88 head which is open chamber head unlike the E31 head. E88 does have smaller valves but same head chamber shape as N42/N47. Also, I got a flow bench sheets of the P79 and N42 here. I can scan them and send them to you if you want. Well, When I said less pocket area, I meant intake runner behind the intake valves like you said. But what I meant when I said less was the P79 has better transition because the valves are set higher and there are less transition there. Sorry I don't explain thing good. Anyhow, a time slip or a dyno sheet is what I want to see. I've seen what P79 can do but I've not see anybody running N head with same result. Except may be Norm but he's kind of out of question.

the oil holes on the head are located at same place so you can swap the older cam towers with newer ones. I'm going to be running e88 head with drilled cam and N47 cam towers. Just change the whole set.

Nissan did record 10HP increase with p79 head with flat top pistons. I think that's conviencing enough. I had chance to compare the older E88 head which is indentical to N42 head and P79 and P79 does look better because the intake runner are less curved with less pocket area and also P79 is close chamber with more quinch area. BTW, the round exhaust ports does flow 10% less on the flow bench but the exhaust flow is not really critical for a street car shifting between 6500rpm to 7000rpm. Intake flow is what makes the difference. Norm used to run ported intake head with stock exhaust ports. This argument can go on forever. I think the time slips should prove the myth. I run 9.7@70mph in 1/8mi, 15.4@90mph in 1/4 with stock 8.3:1 '78 EFI motor with 274 cam from MSA. I'll be running 10.3:1 with a shaved E88 and same cam on 78 bottom end. I'll let you guys know the result. I almost forgot, how about 40mm side drafts with no venturis? I've heard that from older Toyota guy. That's 40mm wich is about same as 45/44mm with venturis.

you can take the stater off and jam something on the flywheel too.

Last 9 sec 1g Z I saw was twin KKK turbo 2.9L stroked with twm intake managed with Motec box. That I can believe.

DSM motor right? there is no power in lower rpm. I've talked to several DSM guys and they are shifting like 8k-9k rpm may be more. They are always talking about 6 bolts and 7 bolts whatever. 7 bolts is supposed to be better. don't get a stage V turbine unless the 2.4L is going to be a heavy breather. on 2L, it won't boost.

I think there are 3 different kind. E88 from earlir 240Z, 73 240z head, and 260z head. 260Z head have the larger valves. I'm going to use E88 with larger valves with steel seats so I'll let you know how it's going to do.

Looks like it'll work. Good find. stock fuel pressure is like 36 psi so I don't think it'll be a problem. I run my fuel pressure about 44psi with bigger cam.

I don't guess the static weight doesn't matter much. What make the difference is that the weight of the moving crank is more as the stroke is increase since the journals are offset farther apart. Right? Centrifugal force thing. Kind of like when you tie a string to a wieght and spin it around. as the string gets longer, the weight get to harder to turn faster. Also moving more rods and pistons too. My theory there.

I know the L24 is lighter than VG30DETT for sure.

Well, the pistons is made for turbo application. There cut for RB26DETT by JE. There is .240" of metal on top of the pistons uncut. Forged pistons too. Do you think I can't coat the pistons and get away with .100" to "140 of metal?

I think one off L4 will fit. I'm thinking I'll try one like 510 or something.

I got some air tools and carbide cutters. Sooo you need to come and use it!

Well, stroking it with LD crank is not helping me with the compression. 8.36:1 with 2mm gasket I guess I can keep about .020 more that's about it I think before 8:5 to one. 0.120" is 3mm so that might be okay I think. Ira told me to be careful about shaving the top of pistons. He might know the masic number. I think alternative way is to unshroud the valves a lot. run like 60cc head Anyway, I like to measure your piston. I'm going to get in touch with you tomorrow. May be we'll tinker with your slow sixty Z too.

try the turbo/supercharger section

with 60mm tb, the efi probably going to responce better then twins. Welcome back How's your turbo project coming?

Okay, it's really a general piston question. How much metal do you need on top of the piston for turbo application? Is more metal better or less metal better? Reason why I'm asking is that I got a set of JE pistons that have domes. (.140" dome to be exact) I need to get them shaved for compression reason. I've measured the pistons and the dome and I found out that I would end up with .100" of metal after I shave the dome off. What do you guys think?

you can use tps off just about any nissan after 300zx. I'm using 60mm Tb now with 300zx tps which is same as 240sx one. I had to bend and shave the linkage on mine. I'm not too happy with it. I liked the 300zx tb which was 55mm. oh well.

I don't know the size of the compressor wheel but this say the trim is .60

If you can use the JDM R200 off 240sx or silvia, you can just use the one from 95+ Infiniti J30. 3.90 VLSD. I heard from it from 240sx owner. For 240sx, it's a direct swap. But I don't know if the spline is same or not. I'll be checking it out soon though.

bad wires may be? Check the ohm of the wires. Check the point too

lol. good driving