Evo BT Timing
#11
08-01-2017, 04:07 PM
Supporter
What did you have 12.5 to 1 compression?
8>1 = 102.9 psi
8.5>1= 102.9 - 110.25 psi
9>1= 110.25 - 117.6 psi
9.5>1= 117.6 - 124.95 psi
10>1= 124.95 - 132.65 psi
10.5>1= 132.3 - 139.65 psi
11>1= 139.65 - 147 psi
11.5>1= 147 - 154.35 psi
12>1= 154.35 - 161.7 psi
I have never seen 165 on any motor I have checked the compression on...this chart is supposed to be close...my stock evo does about 110.
8>1 = 102.9 psi
8.5>1= 102.9 - 110.25 psi
9>1= 110.25 - 117.6 psi
9.5>1= 117.6 - 124.95 psi
10>1= 124.95 - 132.65 psi
10.5>1= 132.3 - 139.65 psi
11>1= 139.65 - 147 psi
11.5>1= 147 - 154.35 psi
12>1= 154.35 - 161.7 psi
I have never seen 165 on any motor I have checked the compression on...this chart is supposed to be close...my stock evo does about 110.
Also the throttle needs to be at WOT, and the slide raised if it's a CV, and a fully charged battery.
Bone stock EVO should be in the 150psi range.
http://www.bigboyzheadporting.com/EVOComp.htm
#12
08-01-2017, 04:25 PM
Supporter
Bobbed, if it's hitting on one cylinder and you have spark on both, it shouldn't be a cam sensor plate timing adjustment issue, could still be an ignition problem,
simple stuff first, did you try to swap spark plugs front to rear?
maybe check for vacuum leak at intake and carb seals.
Can you turn the pushrods by hand on each cylinder when at TDC?
simple stuff first, did you try to swap spark plugs front to rear?
maybe check for vacuum leak at intake and carb seals.
Can you turn the pushrods by hand on each cylinder when at TDC?
#13
08-01-2017, 08:07 PM
Seasoned HDF Member
What did you have 12.5 to 1 compression?
8>1 = 102.9 psi
8.5>1= 102.9 - 110.25 psi
9>1= 110.25 - 117.6 psi
9.5>1= 117.6 - 124.95 psi
10>1= 124.95 - 132.65 psi
10.5>1= 132.3 - 139.65 psi
11>1= 139.65 - 147 psi
11.5>1= 147 - 154.35 psi
12>1= 154.35 - 161.7 psi
I have never seen 165 on any motor I have checked the compression on...this chart is supposed to be close...my stock evo does about 110.
8>1 = 102.9 psi
8.5>1= 102.9 - 110.25 psi
9>1= 110.25 - 117.6 psi
9.5>1= 117.6 - 124.95 psi
10>1= 124.95 - 132.65 psi
10.5>1= 132.3 - 139.65 psi
11>1= 139.65 - 147 psi
11.5>1= 147 - 154.35 psi
12>1= 154.35 - 161.7 psi
I have never seen 165 on any motor I have checked the compression on...this chart is supposed to be close...my stock evo does about 110.
#14
08-01-2017, 10:46 PM
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Bobbed, if it's hitting on one cylinder and you have spark on both, it shouldn't be a cam sensor plate timing adjustment issue, could still be an ignition problem,
simple stuff first, did you try to swap spark plugs front to rear?
maybe check for vacuum leak at intake and carb seals.
Can you turn the pushrods by hand on each cylinder when at TDC?
simple stuff first, did you try to swap spark plugs front to rear?
maybe check for vacuum leak at intake and carb seals.
Can you turn the pushrods by hand on each cylinder when at TDC?
#15
08-02-2017, 02:10 AM
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#16
08-03-2017, 10:54 PM
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#17
08-03-2017, 11:29 PM
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Originally Posted by Bobbed
Update: pulled the plugs and switched them. No resolve, did a leakdown test and passed. Then checked the valves which are both opening. 1st cy kinder still acting like it's missing
Make the swap at the coil end.
How about the intake manifold?
#19
08-04-2017, 07:01 AM
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#20
08-04-2017, 11:11 AM
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