Re: Dyno #s - YO BOB!

From: dwmagnum (dwmagnum@mountaincable.net)
Date: Wed Nov 27 2002 - 01:44:47 EST


YO - BOB!, the cap and rotor - YEH! the same problem I had with the
Shelby Dak. Lots of ugly white crud. DW

Bob Tom wrote:
>
> For all you 1/4-milers,
>
> Last winter I ported my heads with the MP porting templates.
> My decision for going this route came down to money.
>
> My SAE corrected numbers with the stock heads:
> Peak HP: 226.1 @ 5000
> Peak Torque: 257.2 @ 4500
>
> My SAE corrected numbers with the ported heads:
> Peak HP: 241.7 @ 5750
> Peak Torque: 254.1 @ 4250
>
> Unfortunately, circumstances dictated that two dyno shops
> using different software and hardware were used so that
> comparing the numbers is not exactly like comparing
> apples to apples. Also, the printout that I got for the
> ported heads were for increments of 250 rpm and not
> the normal increments of 100 rpm for the stock heads.
> Nevertheless, it gives a close enough ballpark figure of what
> to expect.
>
> With my drivetrain loss, there was a gain of about 20 hp at
> the flywheel. I certainly was pleasantly surprised to see that
> the peak torque rpm had actually dropped a couple of hundreds
> of rpms. I also had expected the peak hp rpm to rise but not quite
> so high.
>
> As for track performance, weather and track conditions did not
> come close to those where I ran my bests last year. 14.313 @ 95.05.
> My best this year was 14.42 and I did up my trap speed to 95.92.
> At the end of Sept. this year, I began to experience intermittent bucking
> and misfiring in the high rpm range. Initial data indicated that the
> problem might be air-fuel related and I concentrated on this area.
>
> Last week, I discovered the problem was the cap and rotor. All the
> contacts were coated with a hard, thick, 'calcium-like' deposit.
> I have never seen a condition like this. Looked like it went through
> Jon's mud pit :-)
>
> Also, when the air temps. began hitting the 40Fs and below, I noticed
> that my coolant temp. was around 150F (city/highway) and barely cracking
> 160 at the track. The 180F tstat turned out to be partially stuck open
> and I was running quite rich.
>
> Just to show you how much the above problems affect performance, the
> dyno numbers with them are:
> Peak HP: 217.9 @ 5600
> Peak Torque: 245.3 @ 4300
>
> Next week I'll be replacing the RT cam with one that is closer match
> to my MPI 4bbl intake and ported heads.
>
> Have a great Thanksgiving, all you USAers.
>
> Bob, Burlington, Ontario.

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