Zardilla

Mike, The HKS valve below is what I am running on my RB26 with a somewhat similar set up as yours, so I think the SSQV should be fine (provided it can hold the boost level you will be running). http://www.racerwheel.com/hks-17670-006100.html Matt

Thanks Q - I'm going to take another look at mine tomorrow, but I don't think they sit "proud" like that.

Yep, poor description my part. The wierd thing is that if the pistons are correct and the block/head is undecked/milled what's causing the dome of the piston to touch the inner edge of the squish pad? One suggestion I've heard is that when I had the block bored out to 87mm the machine shop didn't get the cylinders exactly round and so there is a bit of movement when the pistons are cold and so they are slapping on the squish pad. anyway - thanks again for all the help and suggestions guys.

Thanks Stealth. i'll take another look at the pistons but they appear to be at/below deck level as they should be (CP tech confirms these are zero clearance pistons). So I don't think I have the wrong pistons but its worth a triple check. Only the dome of the piston protrudes (as it should) and the point of impact is just on the inner edge of the squish pad. Altering the pistons is certainly another solution, but I'm not sure I want to mess with CP's design and it means pulling the engine out again and the time involved with that. I'll let everyone know what happens with this in the next few weeks.

Cool, thanks for the additional perspective guys. The current plan is to remove some material off the squish pads (on the head) to provide additional clearance. Hopefully this will do the trick. I may still run a thicker gasket for additional insurance - Cosworth has a 1.5mm version. I'm running GTSS turbos, so we can probably run the boost up to 1.3 bar just fine to make back some of the horsepower loss.

Matt - I don't think the pistons are RB25, unless they were mislabeled - the box showed the correct p/n (sc7311). Of course I didnt buy directly from CP and instead used an Ebay vendor (Eric's performance parts). Nevertheless we'll take another look at how much the pistons protrude. StrokerZedd - I'm considering the 1.8mm gasket as a fix, but we'll be taking some additional measurements today to verify if that will address the issue. Thanks for the helpful comments guys, much appreciated.

When my builder started the motor today he ran into a bit of a problem with the pistons I am using for my rebuilt RB26. It appears the pistons are lightly touching the squish pads. I am running a 1.1 mm Cosworth metal headgasket on an unmodified block and head. Should have kept the CR at stock 8.5 and no clearance issues. Anyone else experience this with CP pistons? I will be putting in a call to CP tomorrow but wanted to hear if anyone else had issues with aftermarket pistons like this. Thanks Matt Two potential solutions are to increase the gasket thickness (lose some compression and performance) or remove material on the squish pads. Not sure if either is ideal.

Thanks for the comments guys. I'm going to get a shroud and see how things turn out.

I'm currently running the PRC (double pass) rad that others on the RB board are. I've had the engine rebuilt and targeting 400rwhp (not heroic), however as I want to do more track days the cooling system needs to be rock solid. My mechanic thinks the electric fan set up will be insufficient and that a mechanical fan will be better. As I said previously, my experience was that the 16" fan did reasonably well, but I'm still looking to hear others experience when putting an RB through extended duty. BTW - I'll be running a setrab oil cooler as well. Thanks

As the topic indicates, I'm curious as to fellow RB z'ers experience with water temps while tracking their cars. I'm running a 16" generic electric fan without a shroud and the day I blew my engine up (unrelated - low oil issues) my temps were staying pretty consistently in the 195 degree range. As I'm finally getting my car back together I've considered running a mechanical fan to provide more CFM, but fabricating a shround for this would be a challenge and I'm not sure how much additional benefit I will gain. I can get a nice shroud for the existing 16" fan or go with dual 11" spals, not sure if this will give much extra either. Any thoughts would be appreciated. Thanks Matt

Thanks Matt - I appreciate your contribution to this board and all your help over the years on my rebuild.

looks great - i need to get my speedhut gauges installed now!

Any update on this? Especially the radiator with engine oil cooler option. Thanks

Paul - are any of the head drain fittings still available? If so I would like to buy one. Thanks Matt

I've installed speedhut gauges (tach, speedo) in my 240z (see my album for photos) that look very similar to the defi gauges. http://www.speedhut.com/

I've now found out that SARD uses a Denso 10.8mm diameter injector whereas Nissan OEM (and Nismo) use a smaller JECS (10mm?) diameter. So I've just ordered a new fuel rail. I guess that's what you get for trying to save a bit of money on injectors (instead of buying Nismo) I'll be running an APEXi D-jetro ecu and with luck will be able to get a smooth idle. Thanks