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by hoffman900
Fri Oct 22, 2021 11:12 am
Forum: Engine Tech
Topic: NASCAR Tri-Y dimensions
Replies: 2
Views: 523

Re: NASCAR Tri-Y dimensions

Thanks, Larry. That helps a lot. Just need some lengths too.
by hoffman900
Fri Oct 22, 2021 11:11 am
Forum: Engine Tech
Topic: New Z06 engine guesstimates?
Replies: 4
Views: 372

Re: New Z06 engine guesstimates?

Not as much as the version in Pratt & Miller's cars. Two 2.25L 4 cylinder engines siamesed at the crank will take some mechanical chicanery to achieve a smooth idle. There's a reason Ferrari never went that big in their v8s. Those are heavily restricted, btw. I do agree there are some inherent issu...
by hoffman900
Fri Oct 22, 2021 10:06 am
Forum: Engine Tech
Topic: Cam Spec.’s for GM’s new 1000 HP pump gas engine
Replies: 33
Views: 1162

Re: Cam Spec.’s for GM’s new 1000 HP pump gas engine

Orr89rocz wrote: Thu Oct 21, 2021 9:45 pm No way thats 100k lol just a fill in number because they likely dont have the price out yet
10s of searching on Google confirmed this. That number is just a place holder and maybe purposely there to generate buzz.
by hoffman900
Mon Oct 18, 2021 7:02 pm
Forum: Engine Tech
Topic: NASCAR Tri-Y dimensions
Replies: 2
Views: 523

NASCAR Tri-Y dimensions

Can anyone share?

Looking for primary diameter / lengths (and steps), secondary lengths / diameters (some seem to step or taper?), choke, and collector size. Typical port length would be helpful too.

I can see some of them from eBay postings, but missing a few critical dimensions.

Thanks
by hoffman900
Thu Oct 14, 2021 2:48 pm
Forum: Engine Tech
Topic: Guys who CNC port
Replies: 21
Views: 1509

Re: Guys who CNC port

We have our own A560 Centroid in house and cnc port heads for many other shops. Once in a while someone wants us to copy their master ports, make the program, and run it exclusively for them. We absolutely respect their wishes. I believe that it would be more difficult to prosecute someone for copy...
by hoffman900
Thu Oct 14, 2021 11:45 am
Forum: Engine Tech
Topic: Guys who CNC port
Replies: 21
Views: 1509

Re: Guys who CNC port

We have our own A560 Centroid in house and cnc port heads for many other shops. Once in a while someone wants us to copy their master ports, make the program, and run it exclusively for them. We absolutely respect their wishes. I believe that it would be more difficult to prosecute someone for copy...
by hoffman900
Thu Oct 14, 2021 11:41 am
Forum: Engine Tech
Topic: Dyno Racing
Replies: 11
Views: 890

Re: Dyno Racing

I know this isn’t a griping thread, but as a spectator, I really lost all interest after they neutered the series after 2013. The vintage class was interesting up until the Smithberg/Adams Hemi and Kaase Y Block, but again, that was neutered as well.
by hoffman900
Tue Oct 12, 2021 2:32 pm
Forum: Engine Tech
Topic: Unique Engine – More Power Needed
Replies: 26
Views: 1655

Re: Unique Engine – More Power Needed

Individual runner carbs are much more sensitive to cam timing and the exhaust than carbs with a plenum between them and the cylinder.
by hoffman900
Sun Oct 10, 2021 4:49 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 45
Views: 1891

Re: Lobe Intensity vs Durability

Absolutely. :lol: Not trying to be difficult or preachy either, but you can see why it's actually a difficult question to answer correctly. Not taken that way in the least and it's all appreciated. As for the difficulty, it's plain to see. Despite the science and the math that goes into a given des...
by hoffman900
Sun Oct 10, 2021 3:44 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 45
Views: 1891

Re: Lobe Intensity vs Durability

Will be interesting when Mike chimes in. It will. As I mentioned those are Jones' profiles. I have to rely on the experience of others unlike the petroleum engineer come camshaft grinder who did it all. Some off the shelf lobes are bound to suit my modest goals but as any hot rodder, I don't want t...
by hoffman900
Sun Oct 10, 2021 3:27 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 45
Views: 1891

Re: Lobe Intensity vs Durability

It's just not that black and white from my experiences. This I'm learning. Case in point is what I have compared to what I need for a change in application and that answer doesn't appear easy to come by. An engine is a complex system with everything having an effect on something else. It's amazing ...
by hoffman900
Sun Oct 10, 2021 11:14 am
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 45
Views: 1891

Re: Lobe Intensity vs Durability

Looking at Cam Dr. I'm not sure if it's the stuff of the hobbyist. Which is what I am. That doesn't mean I don't appreciate all of the science. I'll look into it further. That said, one excellent explanation with respect to ratio vs lobe lift I've come across was posted by CamKing . Ignoring lobe d...
by hoffman900
Sat Oct 09, 2021 3:14 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 45
Views: 1891

Re: Lobe Intensity vs Durability

What I have learned in those numbers don't tell you really how it's going to impact the valvetrain. You need someone who knows what they're looking at to see the derivatives (Cam Doctor level at least). Plenty of old school, low intensity cams out there that actually have crazy acceleration and jerk...
by hoffman900
Wed Oct 06, 2021 11:31 am
Forum: Engine Tech
Topic: Fiat twincam project coming off the stand
Replies: 28
Views: 1868

Re: Fiat twincam project coming off the stand

Remind us what’s the highest redline rpm you’re comfortable with? I have cast pistons. I think I could occasionally hit 7800rpm. I was hoping the bigger cam would lift the torque curve up a bit all along, not just at the very top rpm. The bigger cam has about 10deg more duration at 0.050", only abo...
by hoffman900
Thu Sep 30, 2021 3:43 pm
Forum: Engine Tech
Topic: Naked Ti rods
Replies: 3
Views: 491

Re: Naked Ti rods

piston guy wrote: Thu Sep 30, 2021 2:41 pm There is a coating company in Valencia (Ca) that does DLC coating on ti valves. Can't remember the name but they do them for DelWest.
https://actechnol.com/automotive/ ?