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 Post subject: choking the motor.
PostPosted: Mon Mar 01, 2010 7:55 pm 
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4 BBL ''Hyper-Pak''

Joined: Tue Jan 12, 2010 1:23 pm
Posts: 41
Car Model:
i did a little searching, and in an earlier post a few of you mentioned how the stock 1 bbl choked the motor off at 4000 rpm. is a 2 bbl good for a few hundred more rpms? also, i am hooking my slant up to a dana 44 with 3.07 gears. is this a good gear for the slant, or do i need to do some shopping? thanks.


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 Post subject:
PostPosted: Mon Mar 01, 2010 8:05 pm 
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Site Admin
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Joined: Mon Mar 31, 2003 1:04 pm
Posts: 7417
Location: Oregon
Car Model: 2023 Eichman Digger?
Most with a tight timing chain and stock cam won't turn past 4K, no matter what carb you put on there.

As the timing chain loosens up, they will spin a bit faster. The cam is retarding under load. This moves the envelope the engine operates efficiently at, up. It's also flirting with potential disaster.

Degreeing the cam allows you to adjust where the engine makes it's power without running a worn out timing set. By moving the "Power Band" up, you loose on the bottom though.

I've seen 1bbl slants making power up aournd 5000 rpm. It's all in the cam timing.

CJ

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Part of Tyrde-Browne Racing


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 Post subject:
PostPosted: Tue Mar 02, 2010 8:26 am 
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Joined: Mon Oct 14, 2002 4:32 pm
Posts: 4880
Location: Working in Silicon Valley, USA
Car Model:
I really like the 3.07 ratio in my street car, puts the engine on the "sweet spot" at 70-75 MPH.
DD


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 Post subject:
PostPosted: Tue Mar 02, 2010 9:22 am 
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4 BBL ''Hyper-Pak''

Joined: Tue Jan 12, 2010 1:23 pm
Posts: 41
Car Model:
Wonderful! thats exactly what i was hoping to hear in regards to the gear.


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