Larry:
Your readings are now in the normal range.
You're right, 200 lbs. is a lot for this motor.
The rule of thumb I've heard is that compression readings should be within 10
percent of one another, meaning you've got 14.5-15.5 lbs of wiggle room.
Oh, and by the way, your carb dash pots are correctly aligned if the words "CD
Stromberg" are to the right as you face them.
--
Martin Secrest
73 GT6
72 TR6
lstein6@earthlink.net wrote:
> hey guys,
> before i blew up my 72 gt6 engine i used to have 200 lbs compression in all
> 6 cylinders (really). i don't know how the previous owner got the compression
> so high, but it worked. well that is until it blew up. anyway, now that i
> have the engine rebuilt, with the same high dome pistons (new replacements)
> and a high performace cam etc. i have run the engine a total of 20 minutes on
> the engine stand. yes, i had all the safety gear, radiator etc. hooked up.
> here is my question. i have removed all the plugs and ran a compression test.
> now i have 145 to 155 lbs in each cylinder. they are not all exact as in 150
> for all 6. is 145-155 normal ? okay to have a difference of 10 lbs between
> different cylinders ? the cylinder head is the same one, just completely
> rebuilt with new seats, valves etc. the block is the same one just cleaned,
> honed, machined, the crank is the same one, just polished. are there
> different head gaskets with different thicknesses that can account for the
> previous compression ? the old pistons were the high dome stamped .030, so
> the new ones are the high dome done .040 what do you think ? if i have a
> problem i want to fix it before i put the engine back in the car. or is this
> fine and just move on ahead ?
> thanks for all the great help you guys share !
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