Engine WHAT Happened ???
OOOOOOPPPPPPPPPPPPPSSSSSSSSS Forgot to post these Here !!! :banghead:
Reved up to around 5800 rpms Bang !! Stock pistons stock cam with 1.7's ???? Ran this set up for years??? No problems With P/V clearance Before ??? Spring was not broken Keepers and valve spring were still attatched to the stem of the valve. :confused: http://www.mustangmods.com/data/9385/turbo_047.jpg http://www.mustangmods.com/data/9385...roject_088.jpg http://www.mustangmods.com/data/9385...roject_087.jpghttp://www.mustangmods.com/data/9385...roject_084.jpg |
valve springs wear over time lose the seat pressure at high r.p.m. and the valves float...enough in some instances to slap the psiton...looks like what happend from what i can see
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OK what ones do you recommend they were the stock ones that came with the TFS heads :cheers:
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Originally Posted by Purepower
OK what ones do you recommend they were the stock ones that came with the TFS heads :cheers:
1-866-913-2677 jay or brad...they know all the parts to push a n/a motor to the limits... :tup |
Originally Posted by largeman
aha ...stock tfs valves are crap....you need ferra's or something good....give boss racing a call brad will set you up right with what you need...tfs great heads...lousy valves...
1-866-913-2677 jay or brad...they know all the parts to push a n/a motor to the limits... :tup SS |
both are suspect....hard to tell from the pics...i have heard nothin but not so good things about tfs valves running at high rpm....
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Originally Posted by largeman
both are suspect....hard to tell from the pics...i have heard nothin but not so good things about tfs valves running at high rpm....
SS |
That sucks to see happen but i feel your pain.
How did the block do? i hope it didn't ding up the bore to bad. As for how or why this happend. I have seen valves thay were floating for a wile and u can see on the cam were roller jumps off the cam and smacks back on it. Check the down side of the lobes and all the lifters as well. 3 years with stock cam and only 5800 RPM i cant see this being a prob. My old 302 had x303 cam with dubble springs and stock valves locks and retainers, I got 3 years of banging the gears well into the 7000rpm range to only have one the hold downs snap and have a lifter spin and jam the cam. Ended up snaping the timing chain and 3 valves got bent when the pistons came up and kissed them. Same heads i have on my motor now i cheaped out and changed 3 valves and called it good. I still have the dubble springs in there too. I doubt that u floated the valves and smacked the piston. |
stock valve springs with 1.7's WILL float at high rpm. I've seen a before and after dyno test with 1.7's which resulted in a loss of over 10hp by just switching to the cobra rockers on a 80,000mile 302. Stock valve springs only have 75-80 lbs of seat pressure...
Upgrading to a better valve with a stock cam/heads is a waste of money IMO. Unless the valve was stressed, it's not going to fail. Unless you want to change cylinder heads, use crane #44308-1. She'll give you ~120lbs on the seat, and enough room/spring to go ~.550 lift. The kit includes retainers and locks, and no machining is required. Good luck, Matt |
Originally Posted by THREE40SEVEN
stock valve springs with 1.7's WILL float at high rpm. I've seen a before and after dyno test with 1.7's which resulted in a loss of over 10hp by just switching to the cobra rockers on a 80,000mile 302. Stock valve springs only have 75-80 lbs of seat pressure...
Upgrading to a better valve with a stock cam/heads is a waste of money IMO. Unless the valve was stressed, it's not going to fail. Unless you want to change cylinder heads, use crane #44308-1. She'll give you ~120lbs on the seat, and enough room/spring to go ~.550 lift. The kit includes retainers and locks, and no machining is required. Good luck, Matt SS |
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