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RE: Performance Tuning the Tiger

To: "'Tiger News Group List'" <tigers@autox.team.net>
Subject: RE: Performance Tuning the Tiger
From: Theo Smit <TSMIT@isotel.com>
Date: Fri, 21 Jan 2000 14:49:50 -0700
Let's see...

Assume it's a 302 with 11:1 compression. That makes the chamber volume,
including all domes, head gaskets, valves, spark plugs, etc.
 ( 302 / (11-1) ) / 8 = 3.775 cid = 61.86 cc

So going from 54 to 64 cc heads changes the chamber volume to 71.86 cc =
4.385 cid
The new CR is 1 + 302 / (4.385*8) = 9.608

If it's a 289 with 11:1 the chamber volume is 59.198 cc
Go from 54 to 64 cc and the chamber volume increases to 69.198 cc = 4.223
cid
The new CR is 1 + 289 / (4.223*8) = 9.554

So the CR change depends on the displacement (but we knew that, right?)

Theo

> -----Original Message-----
> From: Steve Laifman [SMTP:Laifman@Flash.Net]
> Sent: Friday, January 21, 2000 6:16 AM
> To:   Alex MacLaurin
> Cc:   Ronak, TP (Timothy); 'Bob Palmer'; 'Tiger News Group List'
> Subject:      Re: Performance Tuning the Tiger
> 
> Alex MacLaurin wrote:
> 
> > With all this talk about compression,I have a question: if a motor has
> 11:1
> > compession with a 54cc chamber and all variables stay the same, how much
> > compression does the engine have with a 64cc chamber?
> 
> Assuming your numbers are accurate:
> 
> 54 cc. x 11 = 594 original volume
> 594 / 64 =  9.28:1
> 
> Compression Ratio = Final Volume / Swept Volume
> 
> I've assumed that the deck height and gasket thickness were contained in
> your
> "chamber" volume, but they usually are not, and need to be known for an
> exactly
> correct answer, but this one is close enough for 'Government Work"
> 
> Steve
> 
> Steve Laifman         < Find out what is most     >
> B9472289              < important in your life    >
>                       < and don't let it get away!>
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