Water in oil from gas?
#22
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I was reverting with a 110° lsa on my big block. I know there’s more to it than just the lsa but 109° is suspect in my shade tree mechanic eyes. The oil pressure is another issue so check with a mechanical gauge. It looks like a strong chance that it’s coming back out.
Does it even have any overlap at .050 " ? Doubt it. 196*/206* duration at .050" is tiny. LSA has to be looked at with duration #'s to come up with enough overlap at .050" lobe lift to cause reversion.
#25
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Thread Starter
I also did a compression test and expected to see a little higher numbers on a new motor. Is it possible I tightened the valves to tight?
#26
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The above cam has -17* overlap at .050 .
A 209/213 at .050 with 114LSA cam has -17* overlap at .050 also.
Here are some popular performance cams :
A 218/224 at .050 with 112 LSA has -4* overlap at .050 .
A 226/232 at .050 with 112 LSA has +5* overlap at .050. With 114LSA it has +1* overlap at .050.
A 236 / 244 at .050 with 112 LSA has +*16 overlap at .050. With a 114LSA it has +12*. overlap
#27
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Thread Starter
Just for fun, had a few minutes, so I ran some #s.
The above cam has -17* overlap at .050 .
A 209/213 at .050 with 114LSA cam has -17* overlap at .050 also.
Here are some popular performance cams :
A 218/224 at .050 with 112 LSA has -4* overlap at .050 .
A 226/232 at .050 with 112 LSA has +5* overlap at .050. With 114LSA it has +1* overlap at .050.
A 236 / 244 at .050 with 112 LSA has +*16 overlap at .050. With a 114LSA it has +12*. overlap
The above cam has -17* overlap at .050 .
A 209/213 at .050 with 114LSA cam has -17* overlap at .050 also.
Here are some popular performance cams :
A 218/224 at .050 with 112 LSA has -4* overlap at .050 .
A 226/232 at .050 with 112 LSA has +5* overlap at .050. With 114LSA it has +1* overlap at .050.
A 236 / 244 at .050 with 112 LSA has +*16 overlap at .050. With a 114LSA it has +12*. overlap
#28
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iTrader: (6)
what preload are you using, I presume hydro roller ?
#29
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Yes hydraulic roller. I wiggled the push rod up and down while tightening until there was no movement left, then spun it with my fingers while tightening until I could not spin anymore. Once that was done I went a 1/2 turn more.
With #1 at TDC I tightened exhaust 1,3,4,8 and intake 1,2,5,7
With #6 at TDC I tightened exhaust 2,5,6,7 and intake 3,4,6,8
With #1 at TDC I tightened exhaust 1,3,4,8 and intake 1,2,5,7
With #6 at TDC I tightened exhaust 2,5,6,7 and intake 3,4,6,8
#30
Platinum Member
Platinum Member
iTrader: (6)
Yes hydraulic roller. I wiggled the push rod up and down while tightening until there was no movement left, then spun it with my fingers while tightening until I could not spin anymore. Once that was done I went a 1/2 turn more.
With #1 at TDC I tightened exhaust 1,3,4,8 and intake 1,2,5,7
With #6 at TDC I tightened exhaust 2,5,6,7 and intake 3,4,6,8
With #1 at TDC I tightened exhaust 1,3,4,8 and intake 1,2,5,7
With #6 at TDC I tightened exhaust 2,5,6,7 and intake 3,4,6,8
Last edited by F-2 Speedy; 10-06-2020 at 10:52 AM.