Dvw, you have taken such care in building this power plant and glad to see that you are still moving forward. Some setbacks but nothing you can't control. I'll continue to get my brain feed from watching you. Thanks
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padam
Well-Known Member
I've never ordered anything that trick. So is there a spec for this on pistons, such as valve size?
Hemirunner
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At 4.350 they’d be intruding plenty. I’m assuming that’s a typo?
As for stretch on a blind hole, CAT developed that process using ultrasound on specially equipped Tools, bolts and studs. Probably not financially translatable to our world, but also not impossible.
Sorry to hear about the pistons and pushrods. Very frustrating when you’re in the home stretch and you have to start over. Tearing it down is definitely the way. After have used piston pin buttons, I’ll never use spirolocks again. Just food for thought.
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6PKRTSE
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Yes, best thing to do is take it all apart and machine the valve pockets on the Bridgeport like you have decided.
They were supposed to be cut for a 2.25" intake. Looks like they were cut for a 2.19" . And yes the gaskets are 4.550" for 4.530" bore. Fortunately I installed all the Spirolox with the ends right next to the access notch. Pulled the #2 intake valve and made a center point for the notch radius. So no both left and right pistons have a center point for the notch layout. Leaving for Indy swap meet this afternoon so I'll pull it down Saturday.
Doug
Doug
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Just got back from vacation down south. Crank scraper is here. Picking up the pistons tomorrow. Car itself is coming back into the shop before the motor reassembly starts. Talked to Eric at Afco. Front shocks going in for revalve this week. Pulling the axle shafts to get started on the 5/8" stud drill and tap.
Doug
Doug
Shocks are shipped. Axles at the machine shop. Sanded the sharp edges left from the valve pocket machining. Cleaned everything up. Reinstalled the rods to the pistons enjoying all 32 Spirolox. Rings reinstalled. Pistons and rods back in the block. Torque and check rod bolt stretch tomorrow.
Doug
Doug
Fantastic workmanship as always, will be great to have it back together. Those Spirolox are stubborn little buggers. They always draw blood when I’m working with them.
Doug were you previously running on 1/2 studs ?
Doug were you previously running on 1/2 studs ?
Hemirunner
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After using pin buttons, I’ll never order those pesky spirolox on custom pistons again.
I actually have Spirolox done pretty well. Its had 1/2" studs since new. After doing some paint touch-up over the winter I got to thinking about it. It would be a shame to break a wheel off and wreck it. Though I can say it's never had an issue with nuts coming loose or bending studs. Though my sons turbo car with stock steel wheels bent 1/2" studs. Would've done it a while ago. Just a little tougher to do with the old Americans. The spacers need to be trimmed to 1.125" diameter to clear the wheel.
Doug
Doug
padam
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Very nice setup. That's the right way to do it.
Doug
Hemirunner
Well-Known Member
Clearanced a lot of those. Did a few with teflon blades that were nearly zero clearance. I wish I would’ve done some before and after dyno testing.
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Once a guy gets the hang of the spirolox they go ok, although I never got the hang of them, always messy when I work with them. I ended up with bent studs a couple years back. They were 1/2” studs and I don’t know the brand of them. I replaced them with 1/2” ARP studs and increased the torque to 120 fl lbs, been good since. There could be some 5/8” studs going in over here at some point but it’s not on the to do list yet. Looking forward to hearing how the new build works out over there.
Heads are on. Figured out the pushrod fix. Milling the deck and heads during the repair caused the pushrods not to fit. They've always been to long. Previously the T&D rocker stand has been shimmed ( pic #2) with 16ga (.060"). It looks like 14ga (.075") will raise the stand enough to work. Granted the pivot is .075" higher than the desired spot for midlife. But it's worked for years so I'm not going to sweat it.
Doug
Doug
Endangered Species
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Drag Race Solutions makes a 12pt 5/8 lug nut.
https://dragracesolutions.com/billet-12-point-lug-nuts that may work well with the Torque Thrust rims.
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