Just installed my PA 13.6 head. Anyone else who has done this check their compression? If so what are you seeing?? I checked and im not sure i can rely on my compression tester, but it looked like at 3 cold pulls i was seeing around 128psi... Is that about right, i know these cfi motors had rather low compression for an 800...
Power Addiction 13.6 head Compression Test?
- Thread starter 06IQRMK
- Start date
R
That should be right the CFI engine only makes around 105 lbs stock and a 13.6 head will add around 20 lbs so it sounds right on the money.
E
Depends on your elevation. What was the increase?
compression
I am at sea level... and stupidly didnt check compression before changing the head. I was under the impressoin that a stock cfi motor would be normally around 115-120 so I was thinking that 125-7 was kind of low for this ratio of head. Feel free to help straighten me out if im backwards thinking... (hehe) my mind is blown already for the week and we leave to go out west on monday.
I am at sea level... and stupidly didnt check compression before changing the head. I was under the impressoin that a stock cfi motor would be normally around 115-120 so I was thinking that 125-7 was kind of low for this ratio of head. Feel free to help straighten me out if im backwards thinking... (hehe) my mind is blown already for the week and we leave to go out west on monday.
W
13.1 head #'s
FWIW
I am at roughly 2000 ft at home. Stock the sled was 120-125 psi on my guage. With the 13.1 head it jumped up to 140-145 psi. This was cold with the throttle open. 4-5 pulls.
FWIW
I am at roughly 2000 ft at home. Stock the sled was 120-125 psi on my guage. With the 13.1 head it jumped up to 140-145 psi. This was cold with the throttle open. 4-5 pulls.
E
2000 ft stock head I was 115 on my gauge. You sound a little low foe sea level. Call Brad and ask.
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Were you doing the test with wide open throttle? this could explain the low result...You need also to make sure that the gauge is really tight. On mine I have to do it by hand then use a plier to give it a bit more other wise I have bad readings...
E
My test was wide open, fyi.
L
i was around mid 120's before and after the head here in alpine wyoming which is 5800 i did a cold check and was pushing 150. right around 146-148
G
3 pulls of the rope is probably not enough to see full results. Pull the plugs, hold the throttle and pull it over untill the gauge stops going up.
