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Old 03-17-2010   #11
Locobob
 
Join Date: Jan 2004
Location: Portland, OR
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Default Re: Camshafts almost done

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Originally Posted by Polo-1 View Post
that's better..... I was thinking you were going to try a .750 + lift
And if he was then you'd have to go for .800 lift wouldn't you Kev
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91 ZR-1 #431 Black/Black LPE 368
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Old 03-18-2010   #12
Polo-1
 
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Default Re: Camshafts almost done

I think my bank roll has hit it's limit on the LT5
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Old 03-18-2010   #13
tpepmeie
 
Join Date: Aug 2005
Location: Fishers, IN
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Default Re: Camshafts almost done

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Originally Posted by Locobob View Post
Details Todd, details!!!
Tool steel billets. With proper hardness. Specs to complement my heads and engine combination... Those aren't finalized yet. If you saw the size of my valve reliefs, I expect lift will be "up there". Designing for peak power at 7k, with a useful powerband 4000-7200.

Will advise of the company doing them once we know they will work, and hold up. Lots of horror stories out there about billets.

Todd
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Old 03-18-2010   #14
Jagdpanzer
 
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Default Re: Camshafts almost done

Todd
I'm sure all will go well with cams
With the thoroughness you've approached this project the results should be outstanding and well worth the effort. I know many like myself have been following your project with great interest and really appreciate your willingness to share your experiences along the way with us.

Phil
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Old 03-18-2010   #15
flyin ryan
 
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Question Re: Camshafts almost done

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Originally Posted by tpepmeie View Post
Lots of horror stories out there about billets.

Todd
Really....Why? Not heat treated properly?
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Old 03-18-2010   #16
tpepmeie
 
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Default bearing journal spec

Cam guy called today. Heat treat is done. He wants to know what the factory specification is for the cam bearing journals. He can copy the oe cams, but would prefer to put it exactly in the middle of the tolerance. I know this dimension stackup was the root cause of the cam seizures early on. Anybody know the tolerance? Perhaps Graham?

Todd
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Old 03-18-2010   #17
Jagdpanzer
 
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Default Re: Camshafts almost done

Not sure that it matters, the heads you will be using on this build are the later Dunns, right?
My 94 FSM specifies the cam journals at 28.96 - 28.98 mm so 28.97 +/- 0.01 mm should work.
I imagine the clearances are fairly tight in the cam cover/cylinder head cam shaft bores.

Last edited by Jagdpanzer; 03-18-2010 at 09:06 PM.
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Old 03-18-2010   #18
Locobob
 
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Default Re: Camshafts almost done

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Originally Posted by tpepmeie View Post
Lots of horror stories out there about billets.

Todd
Yes there are, which is why I'd like to hear the details of your venture. If things go well it could open the doors to a new round of modding. Kudos for taking the lead in this.
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Old 03-18-2010   #19
flyin ryan
 
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Default Re: bearing journal spec

Quote:
Originally Posted by tpepmeie View Post
Cam guy called today. Heat treat is done. He wants to know what the factory specification is for the cam bearing journals. He can copy the oe cams, but would prefer to put it exactly in the middle of the tolerance. I know this dimension stackup was the root cause of the cam seizures early on. Anybody know the tolerance? Perhaps Graham?

Todd
Do yourself a favour Todd & send him your stock cams to measure. Not un-common for all shops/machinists to measure things a hair this way or that way...
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Old 03-27-2010   #20
tpepmeie
 
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Default Re: Camshafts almost done

Here's a few pictures of the setup piece. Sent it to me so that I can check clearances and start grinding the head / cam cover to clear this big lobe. This setup piece is just 4340 steel billet, while the finished pieces will be high grade tool steel. The challenge right now is finding the right springs. Problem is finding a light enough spring with the right installed height, able to take this much lift. We don't need much spring pressure for these, only about 70 lbs on the seat, and 140 or so at full lift.







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