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by hoffman900
Sun Jul 12, 2020 6:41 pm
Forum: Engine Tech
Topic: Header [Blank Post]
Replies: 22
Views: 620

Re: Header [Blank Post]

I've seen headers like the OP has on motorcycles. They're typically more show pieces, which the are good at.
by hoffman900
Fri Jul 10, 2020 12:11 pm
Forum: Engine Tech
Topic: Mr Fueling.
Replies: 25
Views: 1031

Re: Mr Fueling.

DAIMLERCHRYSLER AG v. Feuling Patent lawsuit: https://law.justia.com/cases/federal/district-courts/FSupp2/276/1054/2464973/ He died before this was settled. 1) Ford paid him $2M, then he tried to save on filing fees by claiming small entity status. 2) Failed to disclose earlier three valve designs ...
by hoffman900
Thu Jul 09, 2020 9:31 am
Forum: Engine Tech
Topic: DNA Motoring aluminum SBC heads.
Replies: 13
Views: 480

Re: DNA Motoring aluminum SBC heads.

They are only cheap on initial purchase. More often than not, they need to be completely reworked. Seats not cut properly or concentric, valves not ground properly, super cheap parts if buying assembled, etc...... It's not uncommon to spend as much getting those heads usable as it is just buying a ...
by hoffman900
Thu Jul 09, 2020 8:55 am
Forum: Engine Tech
Topic: Mr Fueling.
Replies: 25
Views: 1031

Re: Mr Fueling.

I'd forgotten that Jon Kasse wasn't the first to route one cylinder's twin exhaust ports to different collectors. Also there appear to be anti-reversion bulges in the primaries. :-k Jon got the idea from looking at Rotax flat track exhausts. They have two ports for one cylinder off the head... pred...
by hoffman900
Thu Jul 02, 2020 12:12 pm
Forum: Engine Tech
Topic: Heads for 400 w/Mike Jones HR cam
Replies: 35
Views: 1264

Re: Heads for 400 w/Mike Jones HR cam

IMO, you should let Mike pick out the profile / cam timing based on the heads you choose, and not the other way around. It would be the same cost and you'll have a better / faster engine.
by hoffman900
Tue Jun 30, 2020 8:10 am
Forum: Engine Tech
Topic: SAM's SB2 At The EMC And The REC
Replies: 48
Views: 2040

Re: SAM's SB2 At The EMC And The REC

500,000+ dyno pulls = 27+ pulls per day, 7 days a week, 365 days a year for 50 years. Impressive! Once again you have jumped to conclusions based solely on what you guys do. If you had called me I could have given you a good few references of folks who have been with me during extended dyno session...
by hoffman900
Mon Jun 29, 2020 11:47 pm
Forum: Engine Tech
Topic: SAM's SB2 At The EMC And The REC
Replies: 48
Views: 2040

Re: SAM's SB2 At The EMC And The REC

Out of curiosity, how many duplicate pulls do you guys make for each change?

When I worked in a corrosion lab, we weighed everything at least three times and a calibration check was performed often. A lab scale is much more accurate / precise then a dyno.
by hoffman900
Thu Jun 25, 2020 2:55 pm
Forum: Engine Tech
Topic: Used Cam
Replies: 17
Views: 945

Re: Used Cam

Billy Godbold mentioned in a podcast that cam cores typically have a high amount of iron in them. REM finishing removes a lot of it on the surface and leaves behind carbide peaks. He mentioned when NASCAR teams tried this it wiped out the DLC coated lifters very quickly. He recommends a kinetic poli...
by hoffman900
Thu Jun 25, 2020 8:47 am
Forum: Engine Tech
Topic: SAM's SB2 At The EMC And The REC
Replies: 48
Views: 2040

Re: SAM's SB2 At The EMC And The REC

Warp Speed wrote:
Thu Jun 25, 2020 5:00 am
500,000+ dyno pulls = 27+ pulls per day, 7 days a week, 365 days a year for 50 years.
Impressive!
According to his book published in 2010, it was 200,000 :?
by hoffman900
Wed Jun 24, 2020 8:38 pm
Forum: Engine Tech
Topic: Ignition curve discussion
Replies: 24
Views: 1049

Re: Ignition curve discussion

2-strokes retard at high rpm to put more heat into pipe, which changes the speed of sound to make pipe look shorter and stay in tune. That is certainly part of the equation. I know each different pipe had a different optimal curve. The fun part came when we found that a two stroke at constant throt...
by hoffman900
Wed Jun 24, 2020 12:57 pm
Forum: Engine Tech
Topic: Early prostock iron heads.
Replies: 41
Views: 2518

Re: Early prostock iron heads.

Steve, I forgot. I had gotten a used GK SBC cast core roller cam around that time which I never ran. At that time I did do a quick check with a degree wheel and dial indicator. Don't know how close these numbers are to Pro Stock at the time. Stan _______I__N__T__A__K__E Rocker_Arm_Ratio_=_1.500____...
by hoffman900
Wed Jun 24, 2020 11:31 am
Forum: Engine Tech
Topic: Painted Connecting Rods?
Replies: 20
Views: 1230

Re: Painted Connecting Rods?

A lot of this was just done via intuition. A lot of thinking / imagining about what is happening because nobody really knew what was happening. We know better now. It doesn't mean these guys were dumb, but they really just didn't know any better and were just trying things they thought made sense (g...
by hoffman900
Wed Jun 24, 2020 10:50 am
Forum: Engine Tech
Topic: Painted Connecting Rods?
Replies: 20
Views: 1230

Re: Painted Connecting Rods?

[*]My old racing buddy Louie always painted the connecting rods in his race engines to encourage shedding the oil off the rods. Just wondering if any of you guys have heard of this.... 50 year old tech! I don't think it was based on anything than your buddy Louie having a hunch, which his line of t...
by hoffman900
Wed Jun 24, 2020 9:32 am
Forum: Engine Tech
Topic: Port work on a Fiat 124 2L head
Replies: 9
Views: 359

Re: Port work on a Fiat 124 2L head

Did Guy share flowbench results for each of his porting Stages?
by hoffman900
Wed Jun 24, 2020 9:23 am
Forum: Engine Tech
Topic: Race exhaust system for Siamese ports
Replies: 3
Views: 351

Re: Race exhaust system for Siamese ports

I hate rules like that. We're at the point that those who were there in the day have died off or are very old. i watched a tech inspector, ~30 years younger than a friend of mine who raced and built Championship winning cars in the day, try to tell him what they did and did not do back then. Sure......