Rebuild the 4l and improve it.

[kyphonii]

if you manufactured a manifold and mounted a turbo under the inlet manifold. Seems to be space. The turbo tuned to 2000 rpm torque at a maximum boost of 7 lb at the valve you would have the torque of a 6 liter or there abouts. ?
right or wrong.


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[kyphonii]

I did a compression test on the 4 litre.
Warm engine.
10 commissions on full throttle and all cylinders are 165 to 175 lbs.
Thoughts ?

[Classic Boy]

Those are good numbers how many swings of the crank to get them?

[kyphonii]

Originally Posted by Classic Boy

Those are good numbers how many swings of the crank to get them?

10 compressions. im not interested in doing dry and wet. Just checking consistency.


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[Classic Boy]

As a guide to cylinders that are relatively well sealed they should hit approximately at least 90% of the final compression figure on the second or third compression stroke when testing.
The real measure of good cylinder sealing is a proper leak down test, but a compression test on a starter motor is a good guide to relative cylinder condition across adjacent cylinders and your figures suggest that your engine is relatively sound.