I wish someone was able to teach me, I would gladly learn.
Ive been reading am I right to understand that with big aluminium heads they don't start to flow well until you reach .500 lift or above?
Given that my cam is only 470 or 480 that seems to suggest that it never is able to make power?
So to make the most of my heads I need to create more lift to reach the .500 that it requires?
When the engine is running everyone says that it sounds amazing, but it doesnt have the lope that the Lunati cam had in it, and it doesnt have the oomph off the line.
I used to drive a Daimler Super V8 so I know what 400bhp feels like and this feels nothing like it.
Yeah me too, have a load of em I believe but not in garage till Friday.
DRIVE IT LIKE STOLE IT,
You don't need the engine running to do a comp test . Remove all plugs , insert tester into spark plug hole crank for the count of 5 and look at the reading and write it down against the cylinder number . Clear the setting and move on to the next cylinder . This will show condition of piston rings , overall compression ratio, loss of individual cylinder compression ( the amount of which will in itself suggest a possible cause ).
Once you have a pushrod and rocker you can start the engine and use the vacuum gauge which will tell you things about valve sealing valve timing , ignition timing etc .Combined together an old hand will be able to see reasons for your issues.
A running engine and rev counter , will allow a stall speed test to tell you what your convertor is doing .
The correect tools and info will allow the more experienced to make EDUCATED guesses a sto cause and advise what further tests are required , if needed, to confirm.
Just to add, it's not the numbers in the compression test that matter but that all cylinders should be within 10% of each other.
A good compression would be around 170Psi but if they were all 120 to 130psi that would still be ok.
What is not ok is if 7 are say 160Psi and one is 120 Psi.
Edit, as you are doing 8 cylinders the last ones will be a bit lower pressure as your battery will be flagging at this point.
Just to add a compression test should be done on a full throttle setting.
Just a passer by as you might say.
Yes, forgot to write that bit - oops!
Got a very busy week ahead this week, but I'm back anyway.
I need to check the studs on my Rocker arms to check what side they are, can I do it by noting the socket size that loosens the nuts on the rocker arms?
(I'm still after a single 7.8" pushrod and 1.5 ratio rocker arm if anyone has any old ones?)
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