no i didn't receive the NGK post.............my hotmail account suffered a brain melt. can you re-post it ????
it's funny that GT falcons and various cars can run huge comp ratios..............but i'm determined to get to the bottom of this !!!!!!!!!
thanks,
dunc.
>From: "Terry Rudd" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: <[EMAIL PROTECTED]>
>Subject: RE: HELP - comp ratio
>Date: Wed, 30 Jan 2002 16:22:13 +1100
>
>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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