Guest Blue02wrx Posted July 26, 2003 Share Posted July 26, 2003 kind of a weird question but me and my friend are buying a complete turbo motor for 200 bucks and he needs the bottom end but nothing else. i was wondering if anyone had ever put everything, including head and injectors...on the n/a block. i'll need a fuel pump, but i was oinly planning on running the stock boost and j-pipe until i can afford more stuff. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 26, 2003 Share Posted July 26, 2003 I'm sure lots of people have. If you do, make sure it's not on an F54 with flat top pistons, you may have a higher compression ratio than you intend. Quote Link to comment Share on other sites More sharing options...
Guest Blue02wrx Posted July 26, 2003 Share Posted July 26, 2003 yeh it's a 82 n/a flatop motor....from what i have read that is a f54 block and has a 8.8 compression ration while the turbo has dished pistons making it a 8.0 compression, the extra .8 should make for a nice boost in performance. and i am planning on the old billitp[roof nissan bottom end. Quote Link to comment Share on other sites More sharing options...
yo2001 Posted July 26, 2003 Share Posted July 26, 2003 I got L26 with P79. Quote Link to comment Share on other sites More sharing options...
Guest eric-z Posted July 26, 2003 Share Posted July 26, 2003 I don't know about your engine(could be different/modified) but I think if you have the stock motor with flat tops then it will have a 8.3 c.r.... the turbo has 7.6.... or at least that is according to http://www.geocities.com/z-car/specs/ Quote Link to comment Share on other sites More sharing options...
Guest Blue02wrx Posted July 26, 2003 Share Posted July 26, 2003 i could be worng about the stock compresion ratios, but i know i have the p79 head and the turbo motor has the p90 head and i am pretty sure they have the same height and combustion chambe making them have equal compression ratios less the piston shape. if that makes any sense. i guess i am saying that putting a p90 head on my flatop motor will give it the exact same c.r. Quote Link to comment Share on other sites More sharing options...
Guest eric-z Posted July 26, 2003 Share Posted July 26, 2003 agreed Quote Link to comment Share on other sites More sharing options...
yo2001 Posted July 26, 2003 Share Posted July 26, 2003 I'm about 7.8:1 to 8:1 compression. I have been running 2mm HKS. I think the compression test was 140-145psi. I'm intercooled though. Quote Link to comment Share on other sites More sharing options...
Guest Blue02wrx Posted July 26, 2003 Share Posted July 26, 2003 will the slighty higher compression ratio be ok for stock 7 psi boost and stock j-pipe. i did compression test and got 165 =+/- 4 psi across the board...i was surprised with a motor that has 165k on it. the valve seals are shot though...she smokes a bit Quote Link to comment Share on other sites More sharing options...
DAW Posted July 27, 2003 Share Posted July 27, 2003 I see a few errors here that could lead to some miscalculated cr's. The stock early L28E had dished (10.9cc) top pistons and with it's N42/47 head made 8.3:1. The later F54 flat-top L28E was 8.8:1 with its P79 head. The L28ET uses dished pistons and P90 head (same chamber volume as P79). If you use the P90 head on an F54 shortblock, you will have 8.8:1 which is a bit high for a turbo engine. If you use an earlier L28E shortblock ('75-'78) and P90 head it would be the same c.r. as a stock L28ET (but it would have na pistons which aren't as strong as the turbo units. DAW Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted July 27, 2003 Share Posted July 27, 2003 FWIW - 2JZGTE motor with 8.5:1 compression cranks out 165PSI here. I'd think 8.8:1 wouldn't be too bad but I guess the flow of the head, effeciency of the turbo, and other things would come into play. I've run 10+ PSI on a V8 with 9:1 compression with NO issues. <shrug> Quote Link to comment Share on other sites More sharing options...
Cody 82 ZXT Posted July 27, 2003 Share Posted July 27, 2003 My first turbo Z was with a F54 block w/ flat tops and a P79. No proublem with it till I wrecked the car. Quote Link to comment Share on other sites More sharing options...
DAW Posted July 29, 2003 Share Posted July 29, 2003 It can definitely be done as a "low-pressure" turbo build up (an intercooler is vital here) but the maximum available horsepower will be less than an engine with lower static c.r. that can run a lot more boost. DAW Quote Link to comment Share on other sites More sharing options...
Cody 82 ZXT Posted July 29, 2003 Share Posted July 29, 2003 It can definitely be done as a "low-pressure" turbo build up (an intercooler is vital here) but the maximum available horsepower will be less than an engine with lower static c.r. that can run a lot more boost. DAW I totally agree with DAW said. It will take some good tuning and proper engine management to have high boost and a compression ratio like what you will end up with. Not saying it can't be done because it has been many times. I wouldn't run more than 7 or 8 psi without an intercooler with the stock turbo. If you upgrade to a larger turbo that will heat the air less then you might could run more. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted July 30, 2003 Share Posted July 30, 2003 I just got mine running properly, its a '79 2+2 2.8 auto with the turbo from a series 2 LD20 4 cylinder on it (pretty damn small) and a manifold from a Nissan Laurel 2L turbo, with the standard L28 N/A inlet manifold, injectors, modified sump, and the computer from the L20. The car is much faster now, it could never do a standstill before but will do one with no trouble now (and this is on 5 pounds), its very loud though I haven't had a chance to go and get the exhaust done so its only about 30cms long Quote Link to comment Share on other sites More sharing options...
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