"Lil Alky", the epic build thread

[alkygto]

Wadaya wanna know? Stiege is also offering drilled rotors for the eaton and I might see if he'll cut me a deal on those. 50% lighter he claims.

UPS man brought my studs and bolts today and I finished disassembling the motor to take to Doug at Button Machine hopefully Friday. Supposed to snow tomarrow though.....

I know you Wisconson guys are like "SOOOO...."

[RegalGS98s]

This is a Snake Bite, it's an internal overdrive, 30%, I think it should get me 12-13 psi on a 3.8 pulley. Check out Steggy's sit, they've got some vids of them on Cobras and they scream. I know Bob personally and built his supercharger flow bench.

Looks like a modified M112 from a Lightning. How does it overdrive 30%. Is the shaft split in the nose with some sort of gearing?

Wadaya wanna know? Stiege is also offering drilled rotors for the eaton and I might see if he'll cut me a deal on those. 50% lighter he claims.
UPS man brought my studs and bolts today and I finished disassembling the motor to take to Doug at Button Machine hopefully Friday. Supposed to snow tomarrow though.....
I know you Wisconson guys are like "SOOOO...."

They've had drilled blower rotors for a while. Unless your full out racing, it's not recommended as the rotors will warp and have to be replaced often.

[alkygto]

They've had drilled blower rotors for a while. Unless your full out racing, it's not recommended as the rotors will warp and have to be replaced often.

Yeah, they have had drilled rotors for a while, my 6-71 has them, as do all 71 series GMC blowers for the past 60+ years. Where do you get your information on "warped" rotors? If the rotors "warp" they'd lock up in the case, I have'nt seen that and I've seen quite a few of these with over 100,000 miles on them.

[RegalGS98s]

Yeah, they have had drilled rotors for a while, my 6-71 has them, as do all 71 series GMC blowers for the past 60+ years. Where do you get your information on "warped" rotors? If the rotors "warp" they'd lock up in the case, I have'nt seen that and I've seen quite a few of these with over 100,000 miles on them.

A good friend of mine used to be an AA class machinist. I'll leave it at he can do some crazy sh*t. He told me about the drilled rotors a while ago when I was discussing blower choices. He says they warp cause the material is of course thinner from drilling it out and they do lock up. When having them drilled they need to be rebalanced perfectly or they'll cause more stress to the bearings. He said they probably last about a 1/3 the time a normal blower would last. I would be interested in drilling the rotors also as when I finally get my build done, I'll be running the M112 (already have 2 of them), but last thing I want to see is for them to lock up. I'd like to see some of that extra weight to go away, but I'll be running the car daily as do a lot of members here. The snakebite also sounds good, but it looks like a good way of splitting the case by removing the rubber coupling (nowhere to give way). I haven't seen a blower specifically split the case from this design, but it's about the same concept as gears in an automatic transmission splitting the case like in my Honda. I'm interested to see a mod list from that GTO. She looks pretty.

[alkygto]

He says they warp cause the material is of course thinner from drilling it out and they do lock up. When having them drilled they need to be rebalanced perfectly or they'll cause more stress to the bearings. He said they probably last about a 1/3 the time a normal blower would last.

Again, 6-71 rotors and many others are drilled. 1/3 the time a normal blower would last? Does that mean I'd only get 40K miles out of it? Bob has a test car with the 50% overdriven SB blower and drilled rotors aproaching 20K test miles. These include track time and dyno pulls so it's not babied. NO problems so I'm not worried in the least. Plus the M90 rotors are shorter than the M112 so I'd think they'd be more "stabil" lol. Interested in your M112 swap, looks like you might be contemplating a lightning case? That would make for an interesting TB location I would think. I have an idea on how that could work, how were you planning on doing it?

Some GTO specs-

434 cu in BB Chevy 9.5-1 comp, 671 Wieand supercharger, 2-850 center squirter Holleys, Bo Laws belt drive fuel pump, Dart Pro 1 heads ported by Stiegemeier, Hooker 2 1/8 headers, custom grind Lunati cam, Tremec 5 speed, Strange 12 bolt 4:11's w/lightwieght billet spool, 4 wdb w/Wilwood MC. Full factory interior including factory bench seat (rare for a GTO).


So......back to camshafts?