Re: Compression ratio testing

Tue, 03 Dec 2002 01:14:52 -0800

Don't have any dyno figures.
I do have a list of the jets used somewhere.  I'll get back to you on that one.
 
Scott
----- Original Message -----
From: Rob P
Sent: Tuesday, December 03, 2002 6:46 PM
Subject: Re: Compression ratio testing

That's reassuring Scott.
Apart from the crankshaft (mine is of unknown origin but nitrided) your motor /carby/ cam setup is identical to mine.
Have you got any dyno figures? Do you know what jets are in the 45s?
 
Cheers,
Rob P
----- Original Message -----
From: Jansons
Sent: Tuesday, December 03, 2002 4:27 PM
Subject: Re: Compression ratio testing

Hey Rob
 
I wouldn't worry too much about having an 89mm bore in a 2 litre mate. I have had two 2 litres and both had 89mm bores.  Current one has been going strong for about 4 years and up until about a year ago it was driven to work and back(100km round trip) and competed in regular lap sprints.  Also has a z22 crank, big port head, 76 degree cam, twin 45s etc.  The only thing that got hurt was my wallet paying for the fuel.
 
Later
Scott
----- Original Message -----
From: Rob P
Sent: Monday, December 02, 2002 9:01 PM
Subject: Re: Compression ratio testing

When I bought the motor, I asked the guy twice whether its capacity was over two litres and he said yes both times.
Basically I wanted to legitimately compete in under 2 litre class competitions.
Maybe the guy lied or just did'nt know,as he did'nt build the motor either. Neither did the guy he bought it off.
Do reckon it's "scarey" because wall thickness is a bit thin on a 89mm bored block?
 
Regards,
Rob P
 
----- Original Message -----
From: Terry Rudd
Sent: Monday, December 02, 2002 6:39 PM
Subject: RE: Compression ratio testing

Still not quite right Errol - the second 60 should be 45 also, the result is correct.
2140cc L20B block is 89cc bore - scary.
 
regards
Terry
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of E Smith
Sent: Monday, 2 December 2002 6:57 AM
To: [EMAIL PROTECTED]
Subject: RE: Compression ratio testing

Apologies, I'll read the post better next time.
 
At 45 cc that means ((12.84 x 45) - [Terry Rudd] 45 (60 )=532.8 cc which would make it a 2140 engine. A much more likely figure.
 
Cheers,
Feral Errol
<http://www.datrats.com.au/>

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Rob P
Sent: Monday, December 02, 2002 1:01 AM
To: [EMAIL PROTECTED]
Subject: Re: Compression ratio testing

Cheers Errol,
You may be right, as Terry has also cast doubts over the validity of the figures.
However, where did you get the 60 in your formula? I cc'd the combustion chamber with the head on the block and this included the chamber volume and the remainder of swept volume (0 cc) and total was 45cc at TDC.
The flat tops must be flush with the top of the block, basically.
 
Regards,
Rob P
 

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