Another one bites the dust

[Humble]

Finished the tear down tonight and there's some good news and bad news besides the cam.

Here's the cam and lifters, #2/4 exhaust is almost gone and the lifters for that lobe are concave.




The #1/3 intake and exhaust lobes were starting to go and the lifters for those lobes were also concave. Cam bearing looked okay so I think the oil filter was doing it's job.


Turns out the crank was a 78mm instead of an 82mm making the motor a 2165 not a 2276 but it turns out the crank is a forged DPR 78mm unit.


bearing surfaces aren't too bad either


I'm guessing these are unitech rods but I could be wrong


I'm worried about this bearing set though you can start to see metal transfer




Not sure if I should keep the rods or upgrade to H beam rods. I'm not sure if these rods will be up to track duty.

Heads looked good, 1/2 side was a little rich or wasn't burning as hot as the rest and I need to find out why. I think it could be related to the accel pump problem I had on that carb.


The 3/4 head looks good


The plan is to rebuild the motor in the spare race case, bump compression to 9.5:1 and use a CB #2246 cam (Adv. Duration 314° / Dur. @ .050" 260° / Lift w/1.25:1 Rocker Arms .514").

[Wally]

Could it be that no. 3 exhaust valve seat has sunken a little?

[petevw]

Originally Posted by Humble

Not sure if I should keep the rods or upgrade to H beam rods. I'm not sure if these rods will be up to track duty.

Upgrade to a set of CB H-Beams. They are not very expensive, and are bulletproof. The Baron runs down the strip with CB H-beams without issue.

Pete

[Humble]

Wally, I think the contrast makes it look sunk in but when I double checked all the valve they were okay.

Pete: I run a set in the other motor as well and I didn't want to spend the money, but I think I'll get a set so I don't worry. I want this motor to be bullet proof.

I got the case back from machining and I'll start pre-assembly today to figure preliminary deck height and rod length. Looks like (on paper at least) the combo should be good for 170-ish with the heads being the limiting factor.

[Arnoud]

Hey Humble why don't you contact Thorsten here on the site(he sells the dry sump pumps in the for sale section)-he makes bullet proof lifters(not cheap-but then again no headaches).

Regards,Arnoud

[Humble]

Believe me I would love to get a set but unfortunately it's not in the budget As it is I'm splurging to get the H-beam rods and that's a stretch. Once I find a job the sky's the limit on parts and I'll probably toss a set of those fancy lifters in the race motor if I can't find a set of ceramics by then.