BBC piston and ring questions
11-29-2012, 04:09 PM
#11
Registered
iTrader: (3)
[QUOTE=mmb;3823610]Chief took the chillers off when they did the Pro 1 head swap. Tommy said they made more power without the chillers..
QUOTE]
Thats actually not the first time Ive heard this statement. Ive also heard it from another reputable builder regarding the chiller on a B&M 420 Setup. The other builder said the chiller was a big waste of money on his setup pretty much. Made more power without it. Doesnt make sense, but Im cant see why these guys would have any reason to lie about it either??
QUOTE]
Thats actually not the first time Ive heard this statement. Ive also heard it from another reputable builder regarding the chiller on a B&M 420 Setup. The other builder said the chiller was a big waste of money on his setup pretty much. Made more power without it. Doesnt make sense, but Im cant see why these guys would have any reason to lie about it either??
11-29-2012, 05:36 PM
#12
Mark you've played with boost enough to know that psi doesn't always equate to more power. (I'm sure someone was going to bring it up) but I know what you mean it was just pumping it out the exhaust. Dry 6's???? You find a money tree near those orange trees down there???? Lol. I understand the chillers causing an intake restriction and losing a bit of power but, dyno the engine cold, then dyno it again after running 45-50 min at 4200 and the intake is heat soaked then dyno it. I'd really like to see the numbers then. I have a huge amount of respect for tommy at chief, maybe he felt they were no help at that power level???? My compression is a bit more than ideal so I won't be taking them out!
11-29-2012, 06:18 PM
#14
Registered
Join Date: Aug 2009
Location: CONCORD, CALIF
Posts: 410
Likes: 0
Received 0 Likes
on
0 Posts
I run srp pistons with Total Seal rings in my blown bbc. The rings are "ap" (advanced profiling) top rings, napier second rings with standard tension oil rings. I like em and they seem to do the trick!
11-29-2012, 06:31 PM
#15
Registered
Join Date: Jun 2011
Posts: 863
Likes: 0
Received 0 Likes
on
0 Posts
[QUOTE=MILD THUNDER;3823620]
It's really simple why the chillers didn't make more power in this situation.
1. The engines make 5.8 lbs at 6,000 rpm no chillers... The blower is running 118% overdrive and normally would be at 8+lbs (this was due to the 264/280 duration @.050 cam)
2. The chillers were put on and made 3lbs of boost, Tommy never repullied the blower to bring the boost back up with the chillers.
Chief took the chillers off when they did the Pro 1 head swap. Tommy said they made more power without the chillers..
QUOTE]
Thats actually not the first time Ive heard this statement. Ive also heard it from another reputable builder regarding the chiller on a B&M 420 Setup. The other builder said the chiller was a big waste of money on his setup pretty much. Made more power without it. Doesnt make sense, but Im cant see why these guys would have any reason to lie about it either??
QUOTE]
Thats actually not the first time Ive heard this statement. Ive also heard it from another reputable builder regarding the chiller on a B&M 420 Setup. The other builder said the chiller was a big waste of money on his setup pretty much. Made more power without it. Doesnt make sense, but Im cant see why these guys would have any reason to lie about it either??
It's really simple why the chillers didn't make more power in this situation.
1. The engines make 5.8 lbs at 6,000 rpm no chillers... The blower is running 118% overdrive and normally would be at 8+lbs (this was due to the 264/280 duration @.050 cam)
2. The chillers were put on and made 3lbs of boost, Tommy never repullied the blower to bring the boost back up with the chillers.
11-29-2012, 06:32 PM
#16
Registered
Join Date: Aug 2009
Location: CONCORD, CALIF
Posts: 410
Likes: 0
Received 0 Likes
on
0 Posts
If it's of any use, srp pistons are made by je. I've read and been told the difference between the two are the material they're made from. Je pistons are a little on the higher end between the two brands. I also forgot to mention that my rings are 1/16th, 1/16th, 3/16th.
11-29-2012, 06:45 PM
#17
Registered
Join Date: Jun 2011
Posts: 863
Likes: 0
Received 0 Likes
on
0 Posts
He also had normal BBC stud girdles on Dart heads.... Umm that's the wrong valve angle... These heads need Dart specific stud girdles....
I have a nice repair bill from Dart rebuilding my brand new heads...
What a Phucking joke....
11-29-2012, 08:16 PM
#19
Registered
Join Date: Jun 2011
Posts: 863
Likes: 0
Received 0 Likes
on
0 Posts
I called Tommy before I bought the boat. Tommy did the new top ends in his shop. Removed the engines from the boat, removed the old heads & installed the new heads. Put the engines back together, set up the valve train.. Dynoed them then reinstalled in the boat.
That's a fact, I was also with Robert in Key West. Robert went up to Tommy right in front of me and said "Tommy, did you do the top ends on my motor? This is the new owner Mark.". Tommy said Yeah Robert you know I did why?
Robert left it alone in Key West but just said... We will be talking soon.
That's a fact, I was also with Robert in Key West. Robert went up to Tommy right in front of me and said "Tommy, did you do the top ends on my motor? This is the new owner Mark.". Tommy said Yeah Robert you know I did why?
Robert left it alone in Key West but just said... We will be talking soon.
