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Search found 1584 matches

by hoffman900
Tue Feb 18, 2020 3:30 pm
Forum: Engine Tech
Topic: Advantages of electric cooling fans vs mechanical
Replies: 27
Views: 1100

Re: Advantages of electric cooling fans vs mechanical

Is there even a single OEM application (including industrial) that uses mechanical fans anymore?

With the proper selection and installation, this should be a no brainer.

Electric fans last a lot longer than any belt will...
by hoffman900
Wed Feb 05, 2020 8:15 pm
Forum: Engine Tech
Topic: Contact at comp cams
Replies: 48
Views: 2084

Re: Contact at comp cams

Sad part is, most of us depend on acquisitions like this, and subsequent stock increase, to maintain growth of our retirement portfolios. Just the way it is... In shops like Crane, Lunati, and Comp,I wonder what % of their profile designs are actually sold 90% of the time... I wouldn’t be shocked if...
by hoffman900
Tue Feb 04, 2020 12:05 pm
Forum: Engine Tech
Topic: Camshaft overlap for plenum manifold vs ITBs
Replies: 28
Views: 778

Re: Camshaft overlap for plenum manifold vs ITBs

So, from your first post asking for an overlap value that avoids part throttle surging on a cross plane V8 and your dislike of the surging in a daily driver to your most recent post with personal dyno experience of part throttle surging, it seems you have the data already to make your decision. It ...
by hoffman900
Sun Feb 02, 2020 5:14 pm
Forum: Engine Tech
Topic: Camshaft overlap for plenum manifold vs ITBs
Replies: 28
Views: 778

Re: Camshaft overlap for plenum manifold vs ITBs

I believe less. The shared plenum dampens the pulses by the time it gets to the carburetor, thus leveling out the AFR curve. An ITB / Weber sees all the bad pulses along with the good. Calvin has given the example of exhaust tricks that work on a single plane 4bbl intake that won’t work on the same ...
by hoffman900
Fri Jan 31, 2020 12:25 pm
Forum: Engine Tech
Topic: Engine Masters
Replies: 87
Views: 2045

Re: Engine Masters

With loosing race tracks and racing associations these days we should be thankful when people step up to keep our hobby alive. Paul Why not start modifying engines that have technology from the 21st century? Just a thought. You can buy, quite literally, just four performance vehicles with a pushrod...
by hoffman900
Mon Jan 27, 2020 4:06 pm
Forum: Engine Tech
Topic: Flat Plane V8 Race Engine - Single Exit Exhaust Question
Replies: 124
Views: 4041

Re: Flat Plane V8 Race Engine - Single Exit Exhaust Question

1000cc Superbikes making ~240bhp+ are using right around a 2.25" outlet... If you look at them closely, you'll see choke be almost the same diameter as the secondaries before tapering up in diameter from there (think a long slow expansion.. maybe 2" to 2.25 or so).
by hoffman900
Wed Jan 22, 2020 2:20 pm
Forum: Engine Tech
Topic: Ls headed 4cyl
Replies: 23
Views: 1119

Re: Ls headed 4cyl

If our tool steel cam cores take off, we will buy the tooling to CNC the gears on the cores. Until then, I can't justify the cost, because the OEM we make cores for doesn't have gears on their cams. The only thing I can think of off the cam would be the oil pump, and even then that seems to be goin...
by hoffman900
Wed Jan 22, 2020 2:09 pm
Forum: Engine Tech
Topic: Ls headed 4cyl
Replies: 23
Views: 1119

Re: Ls headed 4cyl

I called Steve at the time, I couldn't get a call back so gave up. I would have paid up for a good cam, had a deal going with another engine builder and he was working with Gaerte to try to get some volume and the pricing better but Gaerte bailed out was what I was told. Gaerte was working with Bro...
by hoffman900
Wed Jan 22, 2020 11:33 am
Forum: Engine Tech
Topic: Ls headed 4cyl
Replies: 23
Views: 1119

Re: Ls headed 4cyl

LSM does (or did) a minimum order of 5 cores. Not cheap (about $600 a pop, and that was about 6 years ago) and who knows on a timeline. It was about a year then.

Haven’t paid attention to results, but how are the 4Piston Racing Engines Honda’s doing?
by hoffman900
Thu Jan 09, 2020 9:54 am
Forum: Engine Tech
Topic: Flat Plane V8 Race Engine - Single Exit Exhaust Question
Replies: 124
Views: 4041

Re: Flat Plane V8 Race Engine - Single Exit Exhaust Question

Just one further thought. You mention having an AR chamber at or after the final merge, would it be beneficial to add AR chambers elsewhere in system? I see it is quite common to have them in the primaries in 4-1 systems Do factory race cars use anti-reversion chambers? To me, it seems like any app...
by hoffman900
Tue Jan 07, 2020 11:50 am
Forum: David Vizard forum
Topic: The 128 drama!
Replies: 65
Views: 2723

Re: The 128 drama!

Great discussion on hot street/strip, Gen 1 small block Chevys, lol I think 90% of the threads on this site cover those. That was in reference to DV's 128, Bob. These threads always get blown up with stuff about modern engines with multi-million dollar engineering budgets, VVT and all kinds of stuf...
by hoffman900
Tue Jan 07, 2020 10:18 am
Forum: David Vizard forum
Topic: The 128 drama!
Replies: 65
Views: 2723

Re: The 128 drama!

RevTheory wrote:
Tue Jan 07, 2020 8:35 am
Great discussion on hot street/strip, Gen 1 small block Chevys, lol
I think 90% of the threads on this site cover those.
by hoffman900
Mon Jan 06, 2020 7:50 pm
Forum: David Vizard forum
Topic: The 128 drama!
Replies: 65
Views: 2723

Re: The 128 drama!

There’s a Ford paper on restricted intake engines. Compared to unrestricted intake engines, the overlap remained almost the same but exhaust duration had to be reduced a lot and intake duration less. Would this mean that restricted intake would call for a tighter LSA? If that's what happened, then ...
by hoffman900
Mon Jan 06, 2020 7:25 pm
Forum: David Vizard forum
Topic: The 128 drama!
Replies: 65
Views: 2723

Re: The 128 drama!

There’s a Ford paper on restricted intake engines. Compared to unrestricted intake engines, the overlap remained almost the same but exhaust duration had to be reduced a lot and intake duration less. Would this mean that restricted intake would call for a tighter LSA? If that's what happened, then ...
by hoffman900
Mon Jan 06, 2020 7:10 pm
Forum: David Vizard forum
Topic: The 128 drama!
Replies: 65
Views: 2723

Re: The 128 drama!

OEM considerations (emissions, economy etc) for their camshaft choice is probably not the purpose of this thread where the stated method is for WOT performance It isn't, but check out to the two Honda figures showing overlap changing as a function of engine speed and load (which I assume would be t...