|04-05-2009 08:36 PM|
|nastynova||one of those things where i got frustrated... and bagged it up... it turned cold and I havent worked on it since...|
|04-03-2009 11:18 AM|
|04-02-2009 08:43 PM|
anyone still watching this?
Was curious what you came up with / ended up doing to solve problem of rocker arm hitting spring? I am having same problem with RHS protorker heads and Comp cams magnum roller tip rockers 1.5 ratio, but looks to me. moving everything up (longer pushrod/longer stud) will throw off my geometry.
|07-03-2008 06:31 PM|
Cam = Crane #110981
Lifter = Crane #99250
P. Rod = Crane #11621
Rocker = Crane #11744
Retainer = Crane #99943
Spring = Crane #99877 @ 1.83 installed height (spec is 1.85)
Valves = Milodon Mega Flow #45016 Intake \ #45046 Exhaust
Dart Sportsman II heads
have not measured coil bind... looks far from it...
Agree that going longer is tightening things up on rocker, valve centerline and rocker stud centerline converge so is going to.
|07-03-2008 01:13 AM|
once you get longer studs and push rods you will find the rockers most likely will clear the retainer. the sportsman 11 heads have a thicker deck=longer rods. .100 over valves=longer rods.
|07-02-2008 10:38 PM|
I don't know what you have going on, but I've run 1.625 springs on sbc's with nothing like what you have there. Please note everything you have, from valve to cam - all parts used. Also, show the entire rocker in one of those side shots. How are you determining your pushrod length? I had a sbc dart headed mill that used an 8.2" for correct geometry.
|07-02-2008 10:28 PM|
|nastynova||I'll pull the guide plate and use an adjustable rod... looks like I will need to take quite a bit off the rockers or get something slimmer in the trunion area...|
|07-02-2008 10:24 PM|
|SSedan64||Yes that does look slightly better. Only .035" longer than the ones in the other Pics. Looks like another .100" would be close.|
|07-02-2008 10:13 PM|
|ericnova72||Don't know what you mean by worse, geometry looks better to me, but the pushrod still isn't long enough. You are moving in the right direction, but looks to need another .050-.100" longer. As far as the retainer to rocker body interference, these are the Diecast Crane Energizer rockers-correct?? They often need grinding for clearance. My stepbrother had to grind his, which totally turned me off to ever using these rockers myself, and he was using a 1.44" Crower spring. Maybe having .060-.080" machined off the retainer diameter would help, there is plenty of material there for this as the 1.460" spring only really needs a 1.380" retainer o.d.|
|07-02-2008 09:40 PM|
Just for laughs... and you have too... I dropped a 7.80 push rod in...
pic 1 is closed, 2 open... looks worse??? and trunion is tight against retainer...
|07-02-2008 09:56 AM|
|07-01-2008 10:25 PM|
Rockers hitting retainers
I agree with Coldknock, judging from the pics you posted the pushrods you have are too short. This is confirmed by the fact that the pics show the roller contact starting too far inboard( lifter valley side ) and moving too far to the outboard side at full lift. I would expect that with the parts you have that the correct pushrod length will fall in the 7.85"-7.90" range, and will require the use of longer rocker arm studs.
Just for future reference, Crane's recommendations would have been closer to correct if you would have had the spring pads on the heads machined deeper to allow you to achieve the desired installed height using a standard length valve, if the Sportsman II's have enough material to allow it.
Most experienced racers don't buy "matched kits" because they know that there are too many variables for a "one size fits all" kit to cover. Most mix and match parts (and brands) to fit their requirements and budget.
Don't get too hung up on everything being the same brand.
|07-01-2008 08:53 PM|
|nastynova||yes... and my luck it would be too short to..... sigh....|
|07-01-2008 08:52 PM|
Kinda hard to get tire smoke from a Big Bertha.
|07-01-2008 08:36 PM|
|nastynova||i'm looking at only 3/8" now... so longer push rods most likely mean longer studs... one more thing to add to the list... its getting to be a long list on a build that isn't that wild and I never would have imagined to have issues at every turn... i hear golf is fun and i can probably buy a nice set of clubs for what i've got in this thing, but will it put a smile on my face|
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