Author Topic: Dyno sheets from the era  (Read 2535 times)

Jon Mello

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Dyno sheets from the era
« on: October 01, 2011, 06:15:56 AM »
Here is a dyno test run by former GM engineer and Trans-Am racer Jerry Thompson back on 2-13-67. It was a test of two experimental
camshafts in a 302 engine. The first cam, p/n 0-261898, had .495" lift on the intake and .465" on the exhaust. The second cam, p/n
0-302190, also has .495" lift on the intake but a slightly higher lift of .475" on the exhaust. Unfortunately, we don't have any of the
other cam specs but these seem to be in the vicinity of what became known as the first "off-road" camshaft, released to the public in
1968 as p/n 3927140. Interestingly, the first cam with the slightly lower exhaust valve lift yields modestly higher torque and horsepower
readings. The chart paper does not show readings beyond 6,850 rpm and, as such, the second cam may close the gap and/or surpass the
other in the 7,000-7,2000 rpm range.


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Jon Mello

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Re: Dyno sheets from the era
« Reply #1 on: October 01, 2011, 05:02:02 PM »
Here's a dyno test from Febuary 3, 1967. Another test of a 302 with the 0-302190 experimental camshaft.
It looks like milling the heads to increase compression, blocking the heat crossover passage, changing the
valve springs, and porting the heads and intake increased both horsepower and torque.



Jon Mello

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Re: Dyno sheets from the era
« Reply #2 on: October 02, 2011, 06:05:53 AM »
This test shows how setting the valve lash a little differently on this experimental camshaft affects torque and horsepower.



69pace

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Re: Dyno sheets from the era
« Reply #3 on: October 03, 2011, 10:33:51 AM »
Very cool to see these docs survived.
1969 Z-11 350/300 with 4 Speed

Jon Mello

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Re: Dyno sheets from the era
« Reply #4 on: October 22, 2011, 11:56:11 PM »
Here's a dyno test performed by Traco for Roger Penske on Oct 2, 1967. This is a 1x4bbl engine
with Traco-ported heads, transistor ignition and an Engle cam.


srode

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Re: Dyno sheets from the era
« Reply #5 on: October 23, 2011, 12:43:29 PM »
Pretty tight plug gaps for that transistor ignition system.
Steve - 02D Z11 and a Plain Jane hardtop