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Evanso

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  1. Thank you for the advice AydinZ71. I think I will go for dished pistons then as don't want to have pay higher prices for higher octane fuel as this will be daily driver. In the future when I change the car to a full race set up I will rebuild the engine then and change to forged DSI pistons.
  2. Hi Everyone Only just managed to continue work on my engine and I thought I would give you all an update. I got the books you recommended and they have been very helpful. I have taken the head and block to a machine and they said the block needs to be bored at least 20 thou. So I was planning on putting in +40 thou flat top pistons to increase the compression ratio. I was then told that the head needed to be skimmed 20 thou for it to be flat. Now I am worried that with head being skimmed if I were to use flat top pistons the compression ratio would be to high and I could risk detonation. I will be using a OEM head gasket and stock camshaft. Do you think I could get away with flat top pistons or should I get dished to not risk detonation? I would be buying ITM pistons. The online z-engine calculator gives a compression of 10.6:1 for flat top and dished gives 8.85:1 accounting for the skimmed head. In the future I do plan on putting in a longer duration cam but I want to be able to use pump gas as this my daily driver. Thanks for all the advice and help.
  3. Hi Thank you for the advice. I already have the how to rebuild your Nissan engine book. I have now just ordered the how to modify your Nissan engine book. clarkspeed is it worth the extra cost of getting flap top pistons over skimming the head to rais the CR? I am in the UK new pistons would be £300 from zcardepot where as skimming would be £50. Plus I am going to be running the stock cam so with flat top pistons the CR will to high?
  4. Hi I am restoring a 280z and I am at the point where I need to decide what to do with the engine. I have a stock l28(N42 block, N42Head). The engine is out of the car, I have taken the head off and I am going to rebuild the whole thing. Scenario The car is going to be my daily driver for the next few years then after that I plan on it becoming a track car. Therefore it needs to be comfortable to drive but I also want to set myself up nicely to turn it into a track car in the future. I want it to be naturally aspirated and run of pump fuel. I plan on running triple Weber 45's and I have a ZStory race header already. Current Plan (Please let me know any of these are a bad idea) I am going to clean up the block and give it a light hone. Get the crank balanced Get the head ported and polished. Skim 30 thou of the head to bring CR to low 9's, I don't want to add cam tower shims. (Is this worth doing or am I better of not skimming the head? What power increase would I get?) Replace all the bearings, rings and valve stem seals. Question As the engine is apart, what other modifications/upgrades to the block and head would you recommend for my scenario? Potentially looking into a cam. I would prefer to do them now to the engine so I don't have to take it apart again when I turn it into a tack car.
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