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Old 10-30-2008, 07:21 AM   #16
ihpartsjeff
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Default Re: push rod length

Robert,

see if this picture helps any in regards to rocker arm ratio.
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Old 10-30-2008, 08:16 AM   #17
Robert Kenney
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Default Re: push rod length

Jeff,
thanks, that does help with the "boat" type of rocker as I have not had the opportunity to measure them. Good to do a setup with those to map ratio as a function of lift.

The stamped type I have roughly measured the same way and could also do a test of those also.

Typically the off of the seat lift ( calculated like your picture) is different than the overall lift as installed so I would like to test some time.

Robert
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Old 10-30-2008, 09:50 AM   #18
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Default Re: push rod length

Quote:
Originally Posted by ihojeff View Post
they do exist. I've seen them on the mid 70's and later engines.
Bubba...ya think ya actually have an r3 gear or gear set in the pile? I shoulda looked more closely but at the time this was not an issue!
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Old 10-30-2008, 10:06 AM   #19
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Default Re: push rod length

Ok...based on Jeff's shot of a boat rocker, I'm gonna send off to Robert a test setup he can cut up if needed, consisting of an assortment of both boat and welded rocker arms, spacers, spacer springs, and push rods for all apps. Along with some rocker stands that have not been butched! And appropriate hardware for mounting.

Not knowing exactly how he's gonna set this up (onna sectioned head I suppose now??), a single "style" rocker shaft will work since it ain't gonna haveta run, just needs to mount the rockers in proper position.

A cam retainer plate and hardware will be included. That way he can use whatever he wants/needs to prove out this stuff!

We still have time before I send the stuff down, I'm outta pocket this weekend, the timing gear set won't be here until prolly next Tuesday. So it looks like Robert needs a junk head to section also?? Does tim also have a cracked head he can donate? I have a spare usable 152/304 head but shipping costs would be a bitch!

See whatcha started Jesse???
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Old 10-30-2008, 10:17 AM   #20
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Default Re: push rod length

Michael,
I have a complete 9 stand assembly so I really only need 1 intake boat and 1 exhaust boat ra and any special hardware you think I May need for 1 cylinder.

The head will be another thing and you are right damn expensive to ship!!

I think tim has 2 heads in his garage that he May let me use..

with my schedule I won't be able to get to it right away so lets put it on the " ihon to do" list for now.

See mm if I was retired I could keep my self busy also. But I'm not sooooo.....

Robert
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Old 10-30-2008, 10:31 AM   #21
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Default Re: push rod length

Ok!

I just discovered another anomaly in this timing gear shit! But I gotta git the gears and cam outta that early 152 and verify the p/n's.

I'm thinkin' we need a new, separate thread just for the timing gear issue so we don't keep pollutin' Jesse's push rod/engine build deal here, that makes it much easier to work with in future searches. I'm the worst for going off topic with needless bullshit!
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Old 10-30-2008, 11:22 AM   #22
Robert Kenney
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Default Re: push rod length

Michael,
I was thinking the same thing while went to get lunch.
Maybe we can move the posts to a new thread on timing set differences. Even a rockerarm one.

Rk
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Old 10-31-2008, 03:47 PM   #23
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Default Re: push rod length

Christ! All I wanted to know was the push rod length, and that was answered about 20 posts ago.

Robert, did you get these backwards?

just look at lobe lift numbers. Stock iirc is .224 intake and .254 exhaust. Example below in red high light shows considerably more lobe lift but using 1.6 rr. Good cam!!

If we use the rocker ratios you stated (1.76 and 1.7), it would be 0.224 exhaust and 0.254 intake, no? Or?

Thanks,
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Old 10-31-2008, 04:13 PM   #24
Robert Kenney
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Default Re: push rod length

Quote:
Originally Posted by Jesse b. View Post
christ! All I wanted to know was the push rod length, and that was answered about 20 posts ago.

Robert, did you get these backwards?

just look at lobe lift numbers. Stock iirc is .224 intake and .254 exhaust. Example below in red high light shows considerably more lobe lift but using 1.6 rr. Good cam!!

If we use the rocker ratios you stated (1.76 and 1.7), it would be 0.224 exhaust and 0.254 intake, no? Or?

Thanks,
Well,??????? Yes I did get that backwards, I'm not suprised. Thanks good catch.

Robert
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