supercharging N/A engine

gemicrusier · tinkerer Joined: 14 Feb 2003 Posts: 129

thats what i want i have the n/a engine i think its got about 11:2 compressioon but i have also been told about 10:4 or something its got about 140hp rears. i wana super charge it can i drop the compresion enough and run like 5-8 psi or am i dreaming.

thanx

zzz · petrol head Joined: 16 Jan 2002 Posts: 1298

yes you can as above use a copper headgasket you may have to change the cam as well do a search this topic has been
discussed a few times
cheers zzz

gemicrusier · tinkerer Joined: 14 Feb 2003 Posts: 129

yea i know u can lower it a little with decompression palte copper head gasket and cam but i think theres a point of to much compression to lower.

zzz · petrol head Joined: 16 Jan 2002 Posts: 1298

drop in different pistons then or buy a head that hasn't been shaved heaps maybe

Gene FJ20DET · Posted: Tue May 13, 2003 5:03 pm Post subject: while on teh topic

i know 1mm decomp plates will drop compresion ALOT, but i was reading a ZOOM mad and they were doing a HOW TO, on building a monster HP sr20
they use a decomp plate 23mm thick????????????
WTF
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MR_GEMI · Posted: Tue May 13, 2003 5:09 pm Post subject: Re: while on teh topic

FFS thats insane!!
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Ben Wight · backyard mechanic Joined: 04 Oct 2001 Posts: 946

Sure it was a decomp plate and not simply a block extension to allow a longer stroke?

Ben

Gene FJ20DET · Posted: Tue May 13, 2003 5:51 pm Post subject: Re: while on teh topic

i was just thinking that after i posted it. i might dig it up and have a read of it again. but it does ring abell from something ive read
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zzz · petrol head Joined: 16 Jan 2002 Posts: 1298

noway <..>
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DrIFtA · tinkerer Joined: 13 Mar 2003 Posts: 246

Would have been the spacer plate as used in the JUN SR20DET stroker kit, it punches it out to near on 2.2L with longer rods and JUN pistons...

Loz · backyard mechanic Joined: 05 Oct 2001 Posts: 943

Isnt 11:2 compression about 5.5:1. Thats plenty low enough to run a supercharger. Dont know about making 140hp though. Maybe 10-25hp coz thats very low.