RE: HELP - comp ratio

Tue, 29 Jan 2002 21:09:32 -0800

Dyno guy doesn't want to have a blow-up on "his" rollers, understandable. It's not a variable load dyno by the sounds of things.
 
You've got the right idea with simple monitored changes. I wonder what the A/F ratios actually where on cruise and at the top end, if there was a marked variance then the cause of the problem is most likely sussed at least.
 
At sea level I'd recommend that you use 7's at least in summer. Did you read the interesting article on the NGK site that was posted the other night? Worth the read.
 
regards
Terry
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Duncan Shillito
Sent: Wednesday, 30 January 2002 3:52 PM
To: [EMAIL PROTECTED]
Subject: RE: HELP - comp ratio

thanks for the excellent advice terry.

the dyno guy won't let me do a dyno session while it is still pinging..............he said it was ultra rich at cruise and slightly lean at the top end........i'll try some experiments again.

i've already got 38mm chokes......i was hoping to try 34 or 36mm to increase air velocity but also reduce the volume of air. i've checked it against the weber graph.......expected rpm of peak hp vs choke size vs engine capacity. i estimated 5250 for peak hp + 2335cc = 36mm choke.

since the head has been shaved about 30 thou.........i've had to alter the chain guide to reduce slack.........so i'm only really going by the valve movement (measuring lift at the head..........from memory the inlet has to be open 0.4mm more than the exhaust at tdc).

what plugs do you recommend for high cylinder pressures........

i'll get the engine pressure tested for that water leak too before i pull it all apart.

thanks,

dunc. 


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