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broken parts

Post  Larry Williams on May 28th 2012, 9:14 pm

I need suggestions on possible causes to look for. I finally got a couple of passes in with my '88 mustang big small block. My first pass I better my previous best by .15 to 9.61

my next pass it fell off to a 10 flat and some strange noises were heard. I removed the rocker covers and parts fell out. I had broken a rocker shaft and 2 of the 3 mounting bolts. the middle bolt was still there but showed a lot of wear. The shaft broke in the middle of the hole for the unbroken middle mounting bolt. The lifters were up out of the lifter bores. I did find both broken bolts.


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Re: broken parts

Post  whitefield on May 28th 2012, 10:19 pm

what kind of rockers do you have ?

How many RPM you turning ?

Lift on Camshaft ?
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Re: broken parts

Post  dfree383 on May 28th 2012, 10:21 pm

Tell us more about the combo and parts, Any pics?
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Re: broken parts

Post  Larry Williams on May 29th 2012, 12:14 am

438" dart 9.5 block
comp cams solid roller 308/324 duration @ 696/693 valve lift @ 105.5 ICL
harland sharpe shaft 1.6 roller rockers
3/8 dia pushrods
jhans pistons @ 15.5 / 1 comp ratio
total seal gapless rings
glide with brake 4500 stall 1.94 low gear ratio
4.56 gears
950 QFT alky carb
msd dist with crank trigger digital 6 msd box
CSI water pump
morose Vac pump
7400+ through the traps
max power @ 7200
AFR 225 ported heads Manley springs 230 on the seat tit. retainers
Kooks 2" headers
front engine plate
9.5 psi with a 16 volt battery 6.5 with a 12 volte
xs starter
canton pan and pick up
primer plus system
28" tall tires 10.5W

any more info needed?
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Re: broken parts

Post  dfree383 on May 29th 2012, 12:33 am

Spring pressures, Pushrod thickness, Duration @ .050.

How old is everything?
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Re: broken parts

Post  Larry Williams on May 29th 2012, 12:50 am

not sure on thickness till I check tomorrow everything from the block up and the cam has a year of racing the short block is new

intake valve is 2.08

duration @ .o5o is 278/284

spring pressure I checked yesterday was 235 on the seat all with in 3 lbs
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Re: broken parts

Post  dfree383 on May 29th 2012, 9:35 am

whats the over the nose pressure?

Post some pics' on what broke and show the pieces.
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Re: broken parts

Post  Larry Williams on May 29th 2012, 6:53 pm

i have no idea of how to post the pics but I can email some. whats over the nose pressure?
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Re: broken parts

Post  Lem Evans on May 29th 2012, 7:06 pm

Larry Williams wrote:i have no idea of how to post the pics but I can email some. whats over the nose pressure?

open pressure.

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Re: broken parts

Post  richter69 on May 29th 2012, 7:11 pm

Are these the springs that came with the heads or have they been changed?
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Re: broken parts

Post  Larry Williams on May 29th 2012, 7:31 pm

the springs were updated for the solid roller. I got them from AFR they have about 40 runs on them
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