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BB oil pressure #2397798
11/03/17 11:31 AM
11/03/17 11:31 AM
Joined: Aug 2011
Posts: 2,871
Pattison Texas
CSK Offline OP
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CSK  Offline OP
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Pattison Texas
My question is, what is the affect to the oil pressure when a main cap cracks, or when a main webbing cracks on a B block mopar,
Thanks Charlie.

Last edited by csk; 11/03/17 11:37 AM.

1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: BB oil pressure [Re: CSK] #2397862
11/03/17 12:54 PM
11/03/17 12:54 PM
Joined: Mar 2006
Posts: 9,865
MI, usa
dvw Offline
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MI, usa
If the crack goes thru the main oil gallery on the affected cap you will have an internal leak with reduced oil to Tha main and rod pair. How much? Depends on how far the crack spreads apart. My bet is you wouldn't notice more than a 5-10# drop at the most. More noticeable at idle when pump volume is low.
Doug

Re: BB oil pressure [Re: CSK] #2397920
11/03/17 02:15 PM
11/03/17 02:15 PM
Joined: Jan 2003
Posts: 14,512
So. Burlington, Vt.
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fast68plymouth Offline
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The second time a freshened a 493 bracket motor i had built for one of my customers, when I took the #4 main cap off, it was in 2 pieces. It also had a crack running from the main saddle up to the cam tunnel.
Customer never noticed any changes in oil pressure, or performance for that matter.

That motor did have a Milodon dual line system on it though, and those will mask a pretty big leak.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: BB oil pressure [Re: CSK] #2398216
11/04/17 12:35 AM
11/04/17 12:35 AM
Joined: Aug 2011
Posts: 2,871
Pattison Texas
CSK Offline OP
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CSK  Offline OP
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Pattison Texas
Thanks guys .


1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5







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