XD short travel lifter update
11-11-2021 | 07:27 PM
#31
Charter Member #40
Joined: Oct 2000
Posts: 1,255
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From: Cape Coral, FL
Dropped off the engines today, machine shop says they machines bores to .904 all the time not a problem so that`s the route I want to go.
the cam is $hit so need a new one anyway , just not sure what all has to change to run 904`s . Can I run the same cam specs? I assume new pushrods?
the cam is $hit so need a new one anyway , just not sure what all has to change to run 904`s . Can I run the same cam specs? I assume new pushrods?
11-11-2021 | 07:39 PM
#32
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Posts: 14,090
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From: On A Dirt Floor
11-11-2021 | 09:10 PM
#33
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From: Chicago
https://www.crower.com/lifters/hydra...hevy-v8-1.html
Bob is this it?
I don`t see a size on their site ... weird
Bob is this it?
I don`t see a size on their site ... weird
11-11-2021 | 10:36 PM
#34
Platinum Member
Joined: Sep 2001
Posts: 5,769
Likes: 150
From: tn
Sorry you wounded your motors..
The sparkly speckles on your plug insulator are aluminum particles from detonation. Do you know how tight your squish clearance is and what static CR you are running? Rule of thumb on most BBC chambers is that 34 degrees total OUGHT to be close to optimal on gasoline if your squish is tight and your dynamic CR (factoring in cam specs, boost pressure, and intake air temperature). If you can't run 32 to 34 degrees and not run into detonation, then something in your build needs rethought.
is cooling adequate? Is oiling adequate, do you have enough oilng volume, do you need to run restrictors in your oil system to keep adequate pressure and flow to the lifters? Is your intercooler of adequate capacity? It all factors into how close you run to the detonation line.
Brad Penn oil is no longer the product it used to be. Driven oils are some of the better formulations out there and their technical papers on the website are really good reading.
You'll love the reliability of the #6 drives but they noticeably eat horsepower because of the double verticals and larger componentry. Wet sump sixes even more so.
The sparkly speckles on your plug insulator are aluminum particles from detonation. Do you know how tight your squish clearance is and what static CR you are running? Rule of thumb on most BBC chambers is that 34 degrees total OUGHT to be close to optimal on gasoline if your squish is tight and your dynamic CR (factoring in cam specs, boost pressure, and intake air temperature). If you can't run 32 to 34 degrees and not run into detonation, then something in your build needs rethought.
is cooling adequate? Is oiling adequate, do you have enough oilng volume, do you need to run restrictors in your oil system to keep adequate pressure and flow to the lifters? Is your intercooler of adequate capacity? It all factors into how close you run to the detonation line.
Brad Penn oil is no longer the product it used to be. Driven oils are some of the better formulations out there and their technical papers on the website are really good reading.
You'll love the reliability of the #6 drives but they noticeably eat horsepower because of the double verticals and larger componentry. Wet sump sixes even more so.
11-11-2021 | 10:40 PM
#35
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Joined: Oct 2007
Posts: 8,439
Likes: 93
From: yorkville,il
There were a few were tight. I did not know why and mentioned it to my engine builder , I thought maybe the bores were too tight. I wanted to order replacements but you know Covid and none available. He never mentioned it again so I figured all was good.
Mike the burned out piston was opposite of the lifter problem .. so I`m not sure if one was cause and the other affect or if it all went at the same time. On my data log I see the even when the piston broke, boost went from 4 to 10 psi in a split second as did the intake temp. Combustion in the intake. That was at 3700rpm, I heard something weird going, smelled something weird .... a minute later at 5500 rpm is when it started to sound real bad so I shut it down. Maybe thats when the lifter went .
Yes sir Dart BIG M
Great ! I was passing my buddy in a 39 TG lol
Eddie says he hardly ever goes richer than 12`s at wot . I like low 11s . No way am I "washing down cylinders" at 11. unburned fuel at 6000rpm , I don`t think so . When I first got the boat it was in the 9`s and yes the bores had a mirror finish, cross hatch gone and they smoked lie a choo chooo train.
Mike the burned out piston was opposite of the lifter problem .. so I`m not sure if one was cause and the other affect or if it all went at the same time. On my data log I see the even when the piston broke, boost went from 4 to 10 psi in a split second as did the intake temp. Combustion in the intake. That was at 3700rpm, I heard something weird going, smelled something weird .... a minute later at 5500 rpm is when it started to sound real bad so I shut it down. Maybe thats when the lifter went .
Yes sir Dart BIG M
Great ! I was passing my buddy in a 39 TG lol
Eddie says he hardly ever goes richer than 12`s at wot . I like low 11s . No way am I "washing down cylinders" at 11. unburned fuel at 6000rpm , I don`t think so . When I first got the boat it was in the 9`s and yes the bores had a mirror finish, cross hatch gone and they smoked lie a choo chooo train.
11-11-2021 | 10:53 PM
#36
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From: yorkville,il
11-12-2021 | 07:49 AM
#38
Charter Member #40
Joined: Oct 2000
Posts: 1,255
Likes: 104
From: Cape Coral, FL
hydraulic-roller-lifters-396-454-chevy-v8-1.html
Bob is this it?
I don`t see a size on their site ... weird
Bob is this it?
I don`t see a size on their site ... weird
11-12-2021 | 07:54 AM
#39
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Joined: Nov 2004
Posts: 14,090
Likes: 3,679
From: On A Dirt Floor
Dan I run Crower 66291X903H-16 lifters with 9385+ springs in at 2.080" right around 236# and 570# open. Change lifters out at 125 hours and springs at 250 and rockers rebuild at 250. Spray springs down with KE covers and cams down with KE spray bars. Maybe a little over on maintenance frequency but never a failure on a poker run. ??
11-12-2021 | 08:45 AM
#40
Charter Member #40
Joined: Oct 2000
Posts: 1,255
Likes: 104
From: Cape Coral, FL
KE spec'd cams from GS Products (RIP Glen). Lift is like .638". Not sure on duration. Lash is .009" and .011". Try to check lash every 20 or so hours. T&D rockers. Very little change after first adjustment on fresh motors.
