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Search found 1524 matches

by hoffman900
Sun Oct 13, 2019 2:29 pm
Forum: Engine Tech
Topic: 180° cranks
Replies: 20
Views: 771

Re: 180° cranks

https://www.caranddriver.com/news/a27438193/ford-powershift-transmission-problems/ Not sure how this applies to a factory racing effort? This crank isn't even available yet in the production C8 yet. Should work great in a segregated intake / restrictor race engine. You selected age as the parameter...
by hoffman900
Sun Oct 13, 2019 2:22 pm
Forum: Engine Tech
Topic: 180° cranks
Replies: 20
Views: 771

Re: 180° cranks

That's what GM claimed with the Vega, and the Citation. And the V8-6-4. And the HT4100. :) If you were born when all that happened, you would be 40+ years old now. Half the population of the US wasn’t even born yet. Seems like a silly argument... https://www.caranddriver.com/news/a27438193/ford-pow...
by hoffman900
Sun Oct 13, 2019 10:25 am
Forum: Engine Tech
Topic: 180° cranks
Replies: 20
Views: 771

Re: 180° cranks

being a factory effort, this is the real deal, factory resource, kind of development program. That's what GM claimed with the Vega, and the Citation. And the V8-6-4. And the HT4100. :) If you were born when all that happened, you would be 40+ years old now. Half the population of the US wasn’t even...
by hoffman900
Sat Oct 12, 2019 8:55 pm
Forum: Engine Tech
Topic: 180° cranks
Replies: 20
Views: 771

Re: 180° cranks

Here is how it sounds:


Same displacement as this:
by hoffman900
Sat Oct 12, 2019 7:15 pm
Forum: Engine Tech
Topic: 180° cranks
Replies: 20
Views: 771

Re: 180° cranks

Got to see he C8R do a demo lap today. Sounds nothing like the previous generations. I understand progress, but :(
by hoffman900
Sat Oct 12, 2019 6:42 pm
Forum: Engine Tech
Topic: Why does 400" always win the EMC?
Replies: 29
Views: 2508

Re: Why does 400" always win the EMC?

The rules have changed a lot over the years too, so that will effect whatever index you come up with. Way less run what you brung, which has caused me to lose interest, but I can understand the reason (marketing) why.
by hoffman900
Sat Oct 12, 2019 3:38 pm
Forum: Engine Tech
Topic: Why does 400" always win the EMC?
Replies: 29
Views: 2508

Re: Why does 400" always win the EMC?

Ducati had pushed bore limits to 116mm (4.56”), but all subsequent bores are going to be 100mm (3.93”) max from now on for combustion quality.

Of course they’re trying to light off a bore that big that revs to 14,000rpm.
by hoffman900
Fri Oct 11, 2019 10:15 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2414

Re: EMC 289

A V-8 is a pair of odd fire 4 cylinders hooked together to make an even fire 8. V-8 Tri-y work on a 270-450-270-450 basis, the other side is y'ed every other. This common for all 90* v-8's You're right. I had a brain fart. I'm use to seeing them like this: http://www.cobraautomotive.com/catalog/Cat...
by hoffman900
Fri Oct 11, 2019 9:38 pm
Forum: Engine Tech
Topic: Artificial Intelligence to Design Lightweight Parts
Replies: 31
Views: 1135

Re: Artificial Intelligence to Design Lightweight Parts

MadBill wrote:
Fri Oct 11, 2019 9:32 pm
But not the ones with the square cornered windows...
Obviously all this was before my time, but yeah, that was a big oops.

It took McDonnell Douglas a bit to keep the DC-10 from falling out of the air as well :shock:
by hoffman900
Fri Oct 11, 2019 7:28 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2414

Re: EMC 289

Why that cylinder pairing on the tri-y? Did you think about buying the Elston spec headers CA sells? Was there a rule on what constitutes a “production” header? If it’s a catalog item, is it then considered “production” even if made to order? On the Sportbikes that use that pairing, obviously they h...
by hoffman900
Fri Oct 11, 2019 3:19 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2414

Re: EMC 289

It seems there are two threads running under the same title and I'm getting it all mixed-up. Oh, well. I am pretty sure others probably are, also. There is Mummert’s Engine, which Bill-C supplied the basis of the heads for. I asked how this engine differs from the road race versions he uses this he...
by hoffman900
Fri Oct 11, 2019 1:55 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2414

Re: EMC 289

Some sanctioning bodies like SVRA allow aftermarket iron heads and roller valvetrains.580+ hp achieved with proper budget B production 289's FWIW, does SVRA police their rules particularly stringently? I was at one race and saw a beautiful clone of a '69 Trans Am Mustang pulling the field by severa...
by hoffman900
Fri Oct 11, 2019 8:26 am
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2414

Re: EMC 289

Some sanctioning bodies like SVRA allow aftermarket iron heads and roller valvetrains.580+ hp achieved with proper budget B production 289's FWIW, does SVRA police their rules particularly stringently? I was at one race and saw a beautiful clone of a '69 Trans Am Mustang pulling the field by severa...
by hoffman900
Fri Oct 11, 2019 8:21 am
Forum: Engine Tech
Topic: 180° cranks
Replies: 20
Views: 771

Re: 180° cranks

...Note: The exhaust collector. Who thinks there is some anti-reversion stuff going on inside of there? I do. MadBill built an exhaust like that where the tailpipe slips over the actual collector exit. Wow, you must have cranked the Wayback Machine up to eleven to come up with that Bob! =D> I just ...
by hoffman900
Thu Oct 10, 2019 9:26 pm
Forum: Engine Tech
Topic: 180° cranks
Replies: 20
Views: 771

Re: 180° cranks

https://photos.motoiq.com/Event-Coverage/GPLB-2014-Tofa/i-wqZXq6q/1/L/7V7A6014-L.jpg A flat-plane crankshaft makes complete sense in an application like this. It will spread out the pull on the restrictors. Thought they are ultimately limited to a certain horsepower value, it should reduce cycle-to...