kakapoopie Posted June 28, 2009 Share Posted June 28, 2009 Hi all, I'm new to Zs, looking to buy one soon, with a non stock engine combo: L28 N42 block E88 head with early carburetors on it I did a search and haven't found any people with specifically this combination. How will the compression ratio on this combination be? the car is an early 71 Z with the swapped l28 block.(I'm assuming with the early 71 head?) I know this is probably not enough information to make a judgment about compression ratio, but I'm just a bit worried that I haven't found this combination on the boards. Also, I'm new to carburetors. I'm going to need to replace the fuel lines, tank and pump for this car. Do carburetors require an FPR? Should I switch to an electric fuel pump instead of replacing with a stock pump? what is involved with the switch? Thanks for reading. Quote Link to comment Share on other sites More sharing options...
smokeybear Posted June 29, 2009 Share Posted June 29, 2009 The compression should be fine. Also http://www.ozdat.com/ozdatonline/enginedesign/ is awesome for figuring out compression on the L6. I think if you switch to an electric pump you may need a FPR. Check the search button, it should bring up the answers you are looking for. e88 n42 combo yields 8.2:1 compression ratio. but for some reason it says the e88 is from a 260z, which means it is probably smogged down head in terms of math for compression ratio yields. If it is an e88 from a early Z (almost exactly the same as the e31) it gives you 8.5:1 which is the same as a stock l28. Quote Link to comment Share on other sites More sharing options...
kakapoopie Posted June 29, 2009 Author Share Posted June 29, 2009 according to the previous owner it is an early E88. I read somewhere on here that the valves on the E88 are a bit too small for the L28 block? Quote Link to comment Share on other sites More sharing options...
smokeybear Posted June 30, 2009 Share Posted June 30, 2009 http://forums.hybridz.org/search.php Quote Link to comment Share on other sites More sharing options...
260Zz Posted July 9, 2009 Share Posted July 9, 2009 hey i have the same combo as you i got a 77 L28 block and a 72 e88 240 head. with 4 barrel intake manifold with the 390 holley and msa performance header 6-3-2 Quote Link to comment Share on other sites More sharing options...
kakapoopie Posted July 13, 2009 Author Share Posted July 13, 2009 cool, how's it working for you? do you need to run premium fuel with it? Quote Link to comment Share on other sites More sharing options...
SPT260 Posted December 22, 2020 Share Posted December 22, 2020 I actually have this combination with big valves and a mild porting. Big cam. Can't remember specs. I had it running super well until 1997. Car is in pieces currently. Quote Link to comment Share on other sites More sharing options...
SPT260 Posted December 23, 2020 Share Posted December 23, 2020 Mine is the later E88 EFI head with the good squish. I believe Australian only market Skyline Lift back sedan. Correct me if I’m wrong. I’m considering a 89mm bore of the N42 block in my rebuild. Quote Link to comment Share on other sites More sharing options...
SPT260 Posted December 23, 2020 Share Posted December 23, 2020 I ran it with choked triple 50mm Weber’s at one point, and later with 3 screw round tops. Cam and triples wasn’t great for the road! Quote Link to comment Share on other sites More sharing options...
tamo3 Posted December 23, 2020 Share Posted December 23, 2020 Hi @SPT260 What piston do you get for N42 89 bore bottom? I'm thinking about building engine. I have N42 or P90 head, N42 bottom, Diesel clank, 72 240z conrod. I'm looking for K24E pistons 12010-40F10 but it's discontinued.... Quote Link to comment Share on other sites More sharing options...
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