10.5 compression on pump gas

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Bkr9 or something like that is what I run on my 11.25cr, PG 360. It's like 3 steeps colder than a 70 340 calls for. A car with a good stall converter will handle hi comp better than a 4 speed.
 
Why would that be? wouldn't a 4 speed make it so you can leave at whatever rpm you want?
 
autoxcuda said:
I have 9.8:1 compression with aluminum heads, smoothed chambers/edges/spark plug area, chamber fitted to bore so no overlap. Flat top pistons with quench around .030, IIRC. 63 ABDC on the cam. It's got a Dynamic ratio of 7.86

I run California pump 91 octane. In my 416 it will ping at 4000+ rpm going up hill accelerating at hard throttle. I've got the timing at 30 degrees total and run Autolite 3924's
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clinteg said:
Now that is very surprising that you get any sort of pinging considering your setup you've described. Any reason why it would do that with the DCR and SCR that low?
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My guess is that autoxcuda lives at vary low elevation, causing more cyl pressure.
At my elevation he could probably us low test fuel! :D
 
Cudafever said:
My guess is that autoxcuda lives at vary low elevation, causing more cyl pressure.
At my elevation he could probably us low test fuel! :D
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That is going up a pretty steep grade from ~1000 ft to ~ 1700 ft through some mountains on the Santa Susana Pass. I was cruising at 3700 rpm (~80 mph) and a Mustang buzzed by. So I nailed up to around 5800-6000 rpm (130 mph) and backed off. It pinged some through that range.

All uphill. The peak of the Pass is about 1600 ft elevation (base of Rocky Peak) and the base of the Pass is around 950 ft (little before Stoney Point)

Normally where I cruise in Simi Valley is around is 700ft. Willow Springs Raceway is 2500 ft elevation. Don't seem to ping there. But I'm wearing a helmet and it's hard to hear.
 
autoxcuda said:
That is going up a pretty steep grade from ~1000 ft to ~ 1700 ft through some mountains on the Santa Susana Pass. I was cruising at 3700 rpm (~80 mph) and a Mustang buzzed by. So I nailed up to around 5800-6000 rpm (130 mph) and backed off. It pinged some through that range.

All uphill. The peak of the Pass is about 1600 ft elevation (base of Rocky Peak) and the base of the Pass is around 950 ft (little before Stoney Point)

Normally where I cruise in Simi Valley is around is 700ft. Willow Springs Raceway is 2500 ft elevation. Don't seem to ping there. But I'm wearing a helmet and it's hard to hear.
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So just leave out the good part. Geez. Did you pass the Rustang back?
 
RustyRatRod said:
So just leave out the good part. Geez. Did you pass the Rustang back?
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oh yea. Blew by and keep going. He probably didn't want to drive that fast once I went by him.

I looked down and caught myself at 5900 rpm or so and I let off. Its a slight curve and there was a little traffic so I wasn't looking at my speedo/tach. I didn't think I could accelerate that quickly to that speed uphill. I mean it was like 125-130 mph.
 
autoxcuda said:
oh yea. Blew by and keep going. He probably didn't want to drive that fast once I went by him.

I looked down and caught myself at 5900 rpm or so and I let off. Its a slight curve and there was a little traffic so I wasn't looking at my speedo/tach. I didn't think I could accelerate that quickly to that speed uphill. I mean it was like 125-130 mph.
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Don't be doin all that no more. Leave us hangin. What the heck's wrong with you? lol
 
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