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Old 10-10-2004, 03:39   #1 (permalink)
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ZH 351 - few questions

dads zh 351 we just rebuilt the motor....

got a rebuilt thermoquad.
crow cam (2700-5500 range)
2500 stall
std diff
std auto
std exhaust....

its running quite hungry, will a change of the exhaust from stock to extractors and twin 2 1/2 pipes make a difference? and also the diff from the 2.75 to a 3.55....? will economy go up or down?
the exhaust starts to dully glow after its bieng driven hard...

also running in the motor, should we do it on petrol or lpg?

wen we change the diff, is it easy as changin the gears on the tranny to fix up the speedo? (cable driven)

apart form that it goes really well....
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Old 10-10-2004, 04:05   #2 (permalink)
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Re: ZH 351 - few questions

A 3.5 diff will help as it won't be loading up to try and move. Another reason your using more fuel is your stalls mismatched. The diff gears will alleviate most of the issues though. The extractors and a 2 1/4" twin system should be plenty. Doesn't have enough cam to need 2 1/2" pipes. That'll help fuel econ too.

Run the motor in on petrol.

To correct the speedo the gear is available over the counter at Ford or Rarespares etc.

[edit] last thing on the list is a dyno tune.

Brenden
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Old 10-10-2004, 04:14   #3 (permalink)
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Re: ZH 351 - few questions

stall mismatched?

thats what crow told us to get....

wit that cam, get a 2500-2800 stall. 3.5 diff and a set of extractors and big exhaust
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Old 10-10-2004, 16:21   #4 (permalink)
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Re: ZH 351 - few questions

You'll find under hard load it'll bog down with that stall. A standard measure for histalls is anywhere between 500->1000rpm above the start of the power range of the camshaft.

My camshaft comes in @ 3800rpm. I ran a 3500rpm convertor as recommended. It bogged on the start line. I occasionally flooded it when doing a hard launch. I changed to a 4500rpm. 4300 was recommended by my dyno tuner. The car drives nicer and now doesn't bog down.

Don't take it as an oh no I have to change it now thing. Drive it round with everything else changed and see what it does. You've paid for it now. May as well get some wear and tear from it. If it's soggy down low? You 'll know exactly whats causing it.

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Old 10-11-2004, 04:31   #5 (permalink)
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Re: ZH 351 - few questions

it doesnt get driven hard, its just an every day car....
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Old 10-11-2004, 05:46   #6 (permalink)
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Re: ZH 351 - few questions

If you change from 2.75 to 3.5 diff ratio the stall speed will probably be spot on for every day driver
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