broken parts
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broken parts
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.
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.
Larry Williams- Posts : 884
Join date : 2009-08-08
Age : 79
Location : Wallacetown Ontario
Re: broken parts
what kind of rockers do you have ?
How many RPM you turning ?
Lift on Camshaft ?
How many RPM you turning ?
Lift on Camshaft ?
whitefield- Posts : 2244
Join date : 2009-08-23
Age : 56
Re: broken parts
Tell us more about the combo and parts, Any pics?
dfree383- BBF CONTRIBUTOR
- Posts : 14848
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: broken parts
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?
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?
Larry Williams- Posts : 884
Join date : 2009-08-08
Age : 79
Location : Wallacetown Ontario
Re: broken parts
Spring pressures, Pushrod thickness, Duration @ .050.
How old is everything?
How old is everything?
dfree383- BBF CONTRIBUTOR
- Posts : 14848
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: broken parts
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
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
Larry Williams- Posts : 884
Join date : 2009-08-08
Age : 79
Location : Wallacetown Ontario
Re: broken parts
whats the over the nose pressure?
Post some pics' on what broke and show the pieces.
Post some pics' on what broke and show the pieces.
dfree383- BBF CONTRIBUTOR
- Posts : 14848
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: broken parts
i have no idea of how to post the pics but I can email some. whats over the nose pressure?
Larry Williams- Posts : 884
Join date : 2009-08-08
Age : 79
Location : Wallacetown Ontario
Re: broken parts
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.
Re: broken parts
Are these the springs that came with the heads or have they been changed?
richter69- Posts : 13649
Join date : 2008-12-02
Age : 53
Location : In the winners circle
Re: broken parts
the springs were updated for the solid roller. I got them from AFR they have about 40 runs on them
Larry Williams- Posts : 884
Join date : 2009-08-08
Age : 79
Location : Wallacetown Ontario
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