anyone ever spun over a petrol by hand to measure compression?

I dont have a petrol starter for my spare petrol 2,25 engine, but I do want to verify if the block is worth refurbishing. the tops of the cillinders have a noticable groove.

I hand spun the engine by the crank bolt dog it had on it.

Dry: 30/35 psi
Wet: around 50 psi

Anyone who has ever done this and still knows their results? Or better yet, someone who has done both! And may be able to say: X psi by hand equals Y psi while using starter.

Let me know, thanks!

Better off putting your starter on off the landy you’ll get a better reading

To slow by hand.

lynall said:

To slow by hand.

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I'll bet you say that to all the gurls

just jump the starter with 12v, that'll get the reading you require

I will need to buy a seperate starter for this engine, since the engine in my car right now is a diesel. They arent compatible. That is why i would like to measure before i spend tons of money

But i guess ill have to find one on the cheap then according to your experiences! Thanks

Ok , so can you whip off the head look for wear ridge at top and perhaps measure bores that will give a good indication of condition, then you could remove pistons check rings and bearings etc

steve2286w said:

Ok , so can you whip off the head look for wear ridge at top and perhaps measure bores that will give a good indication of condition, then you could remove pistons check rings and bearings etc

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Yep, will do.

The wear ridge is definately there. No doubt. I dont know if i have the proper equipment to measure the bore.

Can be done with a caliper? Or better equipment needed? Will post pics soon

caliper will just do the top, i borrowed one of these, an internal micrometer. very accurate, but on my 2286 i also took block to a machine shop for them to double check , i had a wear ridge that you could feel with fingernail but was only about 3-5 thou , i still decided to get a rebore to start from new

steve2286w said:

caliper will just do the top, i borrowed one of these, an internal micrometer. very accurate, but on my 2286 i also took block to a machine shop for them to double check , i had a wear ridge that you could feel with fingernail but was only about 3-5 thou , i still decided to get a rebore to start from new




View attachment 324473

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Great, will check it out thanks