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re-sleeving an aluminum block
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Author:  Jesse Lackman [ Sat Oct 27, 2001 1:07 pm ]
Post subject:  re-sleeving an aluminum block
Has anyone here attempted to re-sleeve an aluminum block? We have a hair brained idea to use a aluminum slant six block in IMCA Mod dirt track racing. (Last year we used a 3.9L V-6)

I input a 225+ slant six into Desktop Dyno, and when I substituted the 3.125 stroke (instead of the 4.12) Desktop Dyno actually showed a hp increase! Even with the decrease in cubes. What is up with that? The guy I'm working with thought that might be the case.

Revsearch Engine Dyno
rvsrchjl@westriv.com
Author:  Dart270 [ Sat Oct 27, 2001 6:35 pm ]
Post subject:  Re: re-sleeving an aluminum block
Quote:
: Has anyone here attempted to re-sleeve an
: aluminum block? We have a hair brained idea
: to use a aluminum slant six block in IMCA
: Mod dirt track racing. (Last year we used a
: 3.9L V-6)
:
: I input a 225+ slant six into Desktop Dyno, and
: when I substituted the 3.125 stroke (instead
: of the 4.12) Desktop Dyno actually showed a
: hp increase! Even with the decrease in
: cubes. What is up with that? The guy I'm
: working with thought that might be the case.


My guess is that those programs are calibrated and optimized for short strokes and large bores. The equations are probably very simplistic, and so I wouldn't trust it to give you accurate numbers for a Slant. I'm sure the resleeving could be done, but at what cost...

Cheers,

Lou

madsenl@caltech.edu
Author:  Doctor Dodge (Doug Dutra) [ Mon Oct 29, 2001 11:21 pm ]
Post subject:  Re: re-sleeving an aluminum block *PIC*
Quote:
: Has anyone here attempted to re-sleeve an
: aluminum block? We have a hair brained idea
: to use a aluminum slant six block in IMCA
: Mod dirt track racing. (Last year we used a
: 3.9L V-6)
:
: I input a 225+ slant six into Desktop Dyno, and
: when I substituted the 3.125 stroke (instead
: of the 4.12) Desktop Dyno actually showed a
: hp increase! Even with the decrease in
: cubes. What is up with that? The guy I'm
: working with thought that might be the case.


I have re-sleeved alm. SL6 blocks, it's not worth the effort, besides, you don't need to, just go get a 198 and use all the parts in the Alm. 225 block, you end-up with a Alm. Block 198 (3.4 X 3.64) 198's with a good cam and head flow will spin 7500 RPM.

Hey, are there any cubic inch to weight rules? any special classes for smaller engines? If so, go get a cast iron 170, bore it .100 (3.5 X 3.125) lighten the crank, con rods and pistons, stick in a real wild cam, (like a big roller profile) and rev the thing to 8500 RPM,... that will get their attention!

Here is how I "resleeved" the last Alm SL6 I did:
DD



Image
Author:  Jesse Lackman [ Thu Nov 01, 2001 7:47 am ]
Post subject:  Re: re-sleeving an aluminum block
Well the aluminum block we have has a cracked cylinder. We would use the 225 bore. So how would one replace the cracked liner? I do have some ideas.

RevSearch Engine Dyno
rvsrchjl@westriv.com
Author:  Doc [ Thu Nov 01, 2001 8:33 am ]
Post subject:  Re: re-sleeving an aluminum block
Quote:
: Well the aluminum block we have has a cracked
: cylinder. We would use the 225 bore. So how
: would one replace the cracked liner? I do
: have some ideas.


It has to be a real thin sleeve, installed with very little "press", done by a real good machinest.
Call the sleeve makers to see who can do a thin sleeve (.030 to .040 wall, about 10 inches long)

You may be better off finding a good alm. block to work with.
DD
DD
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