XD short travel lifter update
11-10-2021 | 07:03 PM
#12
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Joined: Jun 2004
Posts: 7,317
Likes: 1,037
From: frankenmuth michigan
so yes, I had the bad gas episode rebuild all the heads and one motor.
That was 3 months ago or so .
After that I posted a data log of my run and how nice everything was running on Fakebook and some very well known engine builders told me I`m washing down my rings and I need more timing . at 3700-4000 (3lbs boost) I had 27* and low 12s
I spent some time trying to read plugs to see if this was true. I can`t read a plug to save my life but it looked like the timing mark on the strap was indeed low on timing.
I changed my map to 31.5* at 4000 and 12.5AFRs .
4 hours later I had a hole in the one piston, broken lifter and the engine that was fresh has a scored cylinder .... both motor on the #5 hole.
Efi is too easy to make changes I should have left it alone AND I should have stuck to MY tune . it`s worked for years.
I`m a dumbass. Now I`m paying the price ..
I`m redoing the transom anyway and getting 6`es so I guess the engines were coming out anyway ?? I`m trying to find a positive here lol
That was 3 months ago or so .
After that I posted a data log of my run and how nice everything was running on Fakebook and some very well known engine builders told me I`m washing down my rings and I need more timing . at 3700-4000 (3lbs boost) I had 27* and low 12s
I spent some time trying to read plugs to see if this was true. I can`t read a plug to save my life but it looked like the timing mark on the strap was indeed low on timing.
I changed my map to 31.5* at 4000 and 12.5AFRs .
4 hours later I had a hole in the one piston, broken lifter and the engine that was fresh has a scored cylinder .... both motor on the #5 hole.
Efi is too easy to make changes I should have left it alone AND I should have stuck to MY tune . it`s worked for years.
I`m a dumbass. Now I`m paying the price ..
I`m redoing the transom anyway and getting 6`es so I guess the engines were coming out anyway ?? I`m trying to find a positive here lol
11-10-2021 | 10:39 PM
#13
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Joined: Oct 2007
Posts: 8,439
Likes: 93
From: yorkville,il
damm that sucks,i feel your pain.i think maybe if the intake valve was not opening due to the failed lifter the cylinder was sucking water through the exhaust valve on the intake stroke.the lack of carbon on the piston could be from water in the cylinder.it seems like you just can,t get a break.
Last edited by mike tkach; 11-10-2021 at 10:46 PM.
11-10-2021 | 11:30 PM
#14
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Joined: Nov 2004
Posts: 14,090
Likes: 3,678
From: On A Dirt Floor
We touched on soreading forks in this mega thread:
Cam and valvetrain longevity....??? low duration high lift...
mt thinks it’s (spreading forks) massive set up issue.
Before i forget: quick before i forget: you have dart pro m block ?
Cam and valvetrain longevity....??? low duration high lift...
mt thinks it’s (spreading forks) massive set up issue.
Before i forget: quick before i forget: you have dart pro m block ?
11-11-2021 | 07:49 AM
#15
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Joined: Feb 2009
Posts: 8,356
Likes: 1,515
From: NW Michigan
I would agree with mike tach. I’d also agree with you “icdedppl” and stay away from social media when it comes to high performance engine tuning. Really sucks Dan but could’ve been much worse. What was that engine running like before pulling?
11-11-2021 | 08:19 AM
#16
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Joined: Jul 2009
Posts: 8,527
Likes: 706
From: Taunton Ma
At this point checking valve lash every winter would be the easiest task you’ve ever performed on this boat lol.
thanks for the pics and update on the lifters, good to keep track of real world experiences. Good luck with the projects
thanks for the pics and update on the lifters, good to keep track of real world experiences. Good luck with the projects
11-11-2021 | 08:20 AM
#17
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Joined: Jan 2006
Posts: 3,859
Likes: 791
From: St. Pete Beach, FL
No need to run near .700 lift with that nice blower imo. Let it do the work.
Did you do any logging of the AFR? Eddie said that blower had a side to side AfR issue at idle. Not the area you were tuning, but just a thought. Low 12s isn’t a washing a cylinder, who said that?
Did you do any logging of the AFR? Eddie said that blower had a side to side AfR issue at idle. Not the area you were tuning, but just a thought. Low 12s isn’t a washing a cylinder, who said that?
11-11-2021 | 08:39 AM
#18
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Joined: Feb 2009
Posts: 8,356
Likes: 1,515
From: NW Michigan
No need to run near .700 lift with that nice blower imo. Let it do the work.
Did you do any logging of the AFR? Eddie said that blower had a side to side AfR issue at idle. Not the area you were tuning, but just a thought. Low 12s isn’t a washing a cylinder, who said that?
Did you do any logging of the AFR? Eddie said that blower had a side to side AfR issue at idle. Not the area you were tuning, but just a thought. Low 12s isn’t a washing a cylinder, who said that?
11-11-2021 | 09:20 AM
#19
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Joined: Mar 2021
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I`ve stated that I had no issues running these lifters . I was wrong.
The forks on most have spread making them very hard to take out the bore.
Tie bar also broke.
I`m running 240/586 spring pressures which certainly doesnt help but after 2 seasons they are all about to take a dump.
The rollers are gone and the cam is shot
The forks on most have spread making them very hard to take out the bore.
Tie bar also broke.
I`m running 240/586 spring pressures which certainly doesnt help but after 2 seasons they are all about to take a dump.
The rollers are gone and the cam is shot
11-11-2021 | 09:23 AM
#20
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Joined: Jan 2006
Posts: 3,859
Likes: 791
From: St. Pete Beach, FL
I`ve stated that I had no issues running these lifters . I was wrong.
The forks on most have spread making them very hard to take out the bore.
Tie bar also broke.
I`m running 240/586 spring pressures which certainly doesnt help but after 2 seasons they are all about to take a dump.
The rollers are gone and the cam is shot
The forks on most have spread making them very hard to take out the bore.
Tie bar also broke.
I`m running 240/586 spring pressures which certainly doesnt help but after 2 seasons they are all about to take a dump.
The rollers are gone and the cam is shot
But it looks like this failure mode would only be solved with more lifter diameter if you’re keeping everything else the same. I assume these are .842?
