What went wrong.. cracked rear iron
#1
Rotary Freak
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What went wrong.. cracked rear iron
My car
1987 T2 4000 miles on streetported rebuilt by Kevin Landers
Microtech installed and tuned by "Rolo"
Car pulled 278 hp at 15psi afr of 11-3
all the stuff to support much more HP
Hybird turbo
1600 inj
93 octane fuel only
Fmic
Walboro
Lightened flywheel
act clutch
I did a 3rd gear pull and when I got home I noticed oil leakin from where the iron meets the housing. After much research I now know its the dowel pin cracked iron.
I would like to know what you guys think. The engine has only been in a couple of months I don't want to do this again.
280 is not that much Hp I don't want to have it doweled. I dont do clutch drops either.
I have talked to Kevin he has been helpful and made some very generous offeres. I do not think he is responsible for the break in any way.
I have not spoken to "Rolo" but I do not want to question his ability.
Im not looking to blame anyone but wiould like to prevent this in the future.
Johny Ligon
1987 T2 4000 miles on streetported rebuilt by Kevin Landers
Microtech installed and tuned by "Rolo"
Car pulled 278 hp at 15psi afr of 11-3
all the stuff to support much more HP
Hybird turbo
1600 inj
93 octane fuel only
Fmic
Walboro
Lightened flywheel
act clutch
I did a 3rd gear pull and when I got home I noticed oil leakin from where the iron meets the housing. After much research I now know its the dowel pin cracked iron.
I would like to know what you guys think. The engine has only been in a couple of months I don't want to do this again.
280 is not that much Hp I don't want to have it doweled. I dont do clutch drops either.
I have talked to Kevin he has been helpful and made some very generous offeres. I do not think he is responsible for the break in any way.
I have not spoken to "Rolo" but I do not want to question his ability.
Im not looking to blame anyone but wiould like to prevent this in the future.
Johny Ligon
#3
Displacement > Boost
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This happened to my streetported NA I think because my tension bolts were coming loose. They only had 8 ft-lbs torque on them, and I torqued them to 28 when I assembled the block. I'm guessing the torque impulses against the dowel pins eventually stressed the hole to the point of cracking, and I had the same oil leak in the back right below the filter.
Check your tension bolt torque before you take them out. Blue locktite on the tension bolt threads when assembling has cured the problem for me.
*edit* wow that's a nice sig! Oh yeah!
Check your tension bolt torque before you take them out. Blue locktite on the tension bolt threads when assembling has cured the problem for me.
*edit* wow that's a nice sig! Oh yeah!
#4
MP T-70 = Fun
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the s4 rear iron has a weak spot. same thing happened to a local guy 3 times in a row now. bdc is flying out to rebuild and tune it.
They thing it detonated due to intake temps and a poor tune.
hybrids make make more heat too so i hear. something about the backpressure backing up into the motor and going backinto the intake stroke and heating the charge.
www.coolingmist.com
They thing it detonated due to intake temps and a poor tune.
hybrids make make more heat too so i hear. something about the backpressure backing up into the motor and going backinto the intake stroke and heating the charge.
www.coolingmist.com
#5
Rick James
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Odd, Rolo at CFT tuned my MT and cracked the front housing in the same spot. (last Firday) I'm just taking a stab in the dark here but, it could of been his 3 pulls at 25+ psi that did it. I too don't want to point fingers, only make sure it never happens again. Really not sure why the car was boosted to 25+ psi 3 times in a row as I made it clear that max boost to be 14psi....weird.
#7
Lives on the Forum
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Originally Posted by HIMNI Racing
Really not sure why the car was boosted to 25+ psi 3 times in a row as I made it clear that max boost to be 14psi....weird.
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#8
7th Heaven
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Originally Posted by 88IntegraLS
This happened to my streetported NA I think because my tension bolts were coming loose. They only had 8 ft-lbs torque on them, and I torqued them to 28 when I assembled the block. I'm guessing the torque impulses against the dowel pins eventually stressed the hole to the point of cracking, and I had the same oil leak in the back right below the filter.
Check your tension bolt torque before you take them out. Blue locktite on the tension bolt threads when assembling has cured the problem for me.
*edit* wow that's a nice sig! Oh yeah!
Check your tension bolt torque before you take them out. Blue locktite on the tension bolt threads when assembling has cured the problem for me.
*edit* wow that's a nice sig! Oh yeah!
I find that hard to believe... are you sure you torqued them correctly?
I torqued my engine, to 28, waited a while, retorque it to 28, etc etc.
locktite wasnt used... and you shouldnt either! a better assembling technique might be in order
#9
Alcohol Fueled!
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Originally Posted by slpin
I find that hard to believe... are you sure you torqued them correctly?
I torqued my engine, to 28, waited a while, retorque it to 28, etc etc.
locktite wasnt used... and you shouldnt either! a better assembling technique might be in order
I torqued my engine, to 28, waited a while, retorque it to 28, etc etc.
locktite wasnt used... and you shouldnt either! a better assembling technique might be in order
Lol.. did you miss the part where he says Kevin Landers assembled it?! This could get interesting if he sees this thread.
#10
Alcohol Fueled!
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Originally Posted by Johny zoom
280 is not that much Hp I don't want to have it doweled. I dont do clutch drops either.
I have talked to Kevin he has been helpful and made some very generous offeres. I do not think he is responsible for the break in any way.
I have not spoken to "Rolo" but I do not want to question his ability.
Im not looking to blame anyone but wiould like to prevent this in the future.
Johny Ligon
I have not spoken to "Rolo" but I do not want to question his ability.
Im not looking to blame anyone but wiould like to prevent this in the future.
Johny Ligon
#11
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Originally Posted by J-Rat
Lol.. did you miss the part where he says Kevin Landers assembled it?! This could get interesting if he sees this thread.
TO CLEAR THINGS UP;
The engine Kevin built for me did NOT have loose tension bolts, that was 88 intragals engine.
I sent the engine back to Kevin he sold me an S5 rear iron and installed it for the cost of materials only I felt this was very fair, and If I was to have another engine rebuilt I'd have Kevin do it.
I recently had Steve Kan retune the car making 305 rwhp. I still don't know the cause of the cracked iron I can only speculate now, The s4 irons do infact have a weak spot in the rear iron
While it's always fun to rattle Kevin's cage, please don't do it at my expense.
Johny
#14
Alcohol Fueled!
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Originally Posted by slpin
quoted you for stupidity. and elementary reading skills.
My car
1987 T2 4000 miles on streetported rebuilt by Kevin Landers
1987 T2 4000 miles on streetported rebuilt by Kevin Landers
a better assembling technique might be in order
#15
7th Heaven
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Originally Posted by J-Rat
Umm, pretty sure I read this:
And then I read this:
Either way, I am not getting into a flame war with your pathetic ***.
And then I read this:
Either way, I am not getting into a flame war with your pathetic ***.
scroll up, and re-read everything
looks like you were the one that accused kevin landers
i accused 88integra
maybe if you could read a little better, i could teach you how to drive better than mid 12s with a 115 trap.
#17
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If we're thinking of what im thinking of (the upper corner of the rear iron), then its just an unfortunate weak spot on the engine. if you notice it's beefier on the S5 than S4 and even beefier on the FD engine. good luck getting everything fixed man.
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Originally Posted by HIMNI Racing
I said 25 psi. Latter found it is was 43.4 psi from the profec spec II. Mine was a S5 engine.