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Search found 1879 matches

by RevTheory
Sun Apr 11, 2021 11:55 am
Forum: Engine Tech
Topic: Cam for this project
Replies: 13
Views: 700

Re: Cam for this project

The problem with combos like this is that a heavy truck with larger tires swallows up all the power you can get from a 383 unless you build it snotty and that tends to take away from what you'd intended. I guess you have to decide what you're ok with and let it be. I'm having this very fight in my m...
by RevTheory
Wed Apr 07, 2021 6:06 pm
Forum: Engine Tech
Topic: Any downsides to anti reversion mufflers/devices?
Replies: 77
Views: 5752

Re: Any downsides to anti reversion mufflers/devices?

Is a high-flow cat going to have the volume needed with all of that honeycomb business in there?
by RevTheory
Wed Mar 31, 2021 8:46 am
Forum: Engine Tech
Topic: Late oem style hyd roller cam in a old flat tappet sbc block
Replies: 22
Views: 800

Re: Late oem style hyd roller cam in a old flat tappet sbc block

Would it save you some grief having those lobes measured and ground on the correct cam for the block?
by RevTheory
Fri Mar 19, 2021 12:35 pm
Forum: Engine Tech
Topic: Future of head porting
Replies: 199
Views: 9382

Re: Future of head porting

I don't have a dog in this fight and I can clearly see both sides of the argument and you made a good one. Thanks for responding.
by RevTheory
Fri Mar 19, 2021 11:37 am
Forum: Engine Tech
Topic: Future of head porting
Replies: 199
Views: 9382

Re: Future of head porting

I've seen these types of arguments play out probably hundreds of times. I'm pretty sure that the guy who's been behind a flowbench for 30 years and was really good at it won't listen to a guy with an expensive computer program and vise-versa. A brand new engine platform, absolutely! Something alread...
by RevTheory
Mon Mar 15, 2021 11:34 am
Forum: Engine Tech
Topic: Future of head porting
Replies: 199
Views: 9382

Re: Future of head porting

I've held off on posting in this thread for obvious reasons and I can clearly see both sides of the argument but Darin Morgan said in an interview that there's no way a port can be optimized on a computer the way an experienced cylinder head guy can with a flow bench. He's got tons of experience wit...
by RevTheory
Fri Mar 12, 2021 6:38 pm
Forum: Engine Tech
Topic: 383 dyno results
Replies: 20
Views: 993

Re: 383 dyno results

Chad Speier (aka) 'Chad Bytes" is still doing heads?? Good lord. Cant believe he is still convincing you internet folks that he's some sort of cylinder head god! Its actually funny. I was just talking to another local (Hays, KS) builder the other day. Chad Byte's name came up because I was working ...
by RevTheory
Sat Feb 27, 2021 1:08 pm
Forum: Engine Tech
Topic: Idle vacuum
Replies: 19
Views: 823

Re: Idle vacuum

The steel needs to get to an orange heat and be sure to use an old drill bit or something 3/16" diameter (steel rod or stainless steel tubing for nitrous) in the pivot hole so it doesn't distort during the bending. Very interesting, indeed. Use this trick to limit advance travel, yes? Both weights?
by RevTheory
Thu Feb 25, 2021 7:31 pm
Forum: Engine Tech
Topic: Dynamic compression calculator
Replies: 27
Views: 764

Re: Dynamic compression calculator

Sounds like it might be time for a hot, cranking pressure test.
by RevTheory
Wed Feb 24, 2021 6:51 pm
Forum: Engine Tech
Topic: Any downsides to anti reversion mufflers/devices?
Replies: 77
Views: 5752

Re: Any downsides to anti reversion mufflers/devices?

I wish I knew just how much volume was required because building large boxes sucks. Isn't that spec'd in one of DV'S books? Something along the lines of an empty muffler case per side of a typical V8. It is but I've also seen several guys saying that not nearly that much is needed. I can't remember...
by RevTheory
Wed Feb 24, 2021 4:25 pm
Forum: Engine Tech
Topic: Idle vacuum
Replies: 19
Views: 823

Re: Idle vacuum

You could go old-school and bump the initial up until the starter wants to drag and go back down two degrees. Then you'll have it bracketed and know what stop bushing you'll need to keep your 36* total.
by RevTheory
Wed Feb 24, 2021 2:10 pm
Forum: Engine Tech
Topic: Any downsides to anti reversion mufflers/devices?
Replies: 77
Views: 5752

Re: Any downsides to anti reversion mufflers/devices?

These AR chambers appear to be mini versions of David Vizard's Exhaust collector Termination Box. Vizard's chambers incorporate a metric shit-tonne of volume for reflection and then the inlet sticks into the chamber an inch for anti-reversion. I wish I knew just how much volume was required because...
by RevTheory
Wed Feb 24, 2021 7:50 am
Forum: Engine Tech
Topic: Any downsides to anti reversion mufflers/devices?
Replies: 77
Views: 5752

Re: Any downsides to anti reversion mufflers/devices?

I'm curious as to whether or not there's enough volume in that little chamber that's mostly inner tube to actually cause pressure waves to reflect.
by RevTheory
Sat Feb 20, 2021 6:07 am
Forum: Engine Tech
Topic: Changing surface texture for fuel fallout issue
Replies: 10
Views: 787

Re: Changing surface texture for fuel fallout issue

Hey, no matter how your testing goes, your first pics show where your epoxy guide vein needs to go :D When are you going to be able to test it again? I'm really curious to see how it goes. I would certainly *think* that the chatter you did above the seats will kick that fuel back up into the wind.
by RevTheory
Sun Feb 14, 2021 5:13 pm
Forum: Engine Tech
Topic: Hard cold start sbc
Replies: 13
Views: 447

Re: Hard cold start sbc

You may want to see how far down your voltage firing the HEI is being pulled.