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Search found 1764 matches

by In-Tech
Tue Oct 19, 2021 4:10 am
Forum: Engine Tech
Topic: Vacuum rule carb sizing
Replies: 18
Views: 506

Re: Vacuum rule carb sizing

I like David and have followed his work for years. ~76000+ man hours in cam changes and adjustments thereof? I guess you could do that in ~9 years if you worked 24/365. Seat duration AND lsa matters, concentrate on timing EVENTS, let's not forget engine displacement. Other factors matter as well for...
by In-Tech
Sat Oct 16, 2021 2:27 am
Forum: Engine Tech
Topic: Shiny or black carb for heat
Replies: 36
Views: 1103

Re: Shiny or black carb for heat

since you have bought several this year i suspect you like them :D ,what do you recommend for a SBC 383 that makes 550 ish Apologies for jumping in on this question but what is the intended use of the 550hp 383? I ask because I have tested on my 383 a 650, 750, 825, 850, 850AN, and 975 (that I woul...
by In-Tech
Fri Oct 15, 2021 8:33 am
Forum: Engine Tech
Topic: What's a good CDI box value these days?
Replies: 48
Views: 2144

Re: What's a good CDI box value these days?

The only stock type modules worth buying come from Delphi, not AcDelco.
Here's one
https://www.rockauto.com/en/moreinfo.ph ... 72&jsn=451
by In-Tech
Fri Oct 15, 2021 1:43 am
Forum: Engine Tech
Topic: Annular boosters for a QF 750 DP
Replies: 17
Views: 565

Re: Annular boosters for a QF 750 DP

HQM hit it on the head. The 12 hole and 16 hole annular's are pretty much better all around although you lose a little air flow, due to their size. It's all about fuel curve, as you know. You can steady state on the dyno to make yourself feel better as much as you want, most applications are not ste...
by In-Tech
Fri Oct 15, 2021 1:05 am
Forum: Engine Tech
Topic: Fuelab Filter Opinions
Replies: 1
Views: 138

Re: Fuelab Filter Opinions

I use System1 and also use the largest element I can. On an off road race truck I use two ~40 in sq area filters, one for each pump(redundant) on the outlet and 70 micron filter for the inlet of pumps. It's amazing how much silt gets in the tank. We also keep spare elements for an easy swap in the d...
by In-Tech
Wed Oct 13, 2021 7:51 pm
Forum: Engine Tech
Topic: Unique Engine – More Power Needed
Replies: 26
Views: 1538

Re: Unique Engine – More Power Needed

Original valve size was 1.625 Int Original valve size was 1.625 Int .... and you were able to install a 2.000" inch Intake Valve and not hit water :shock: .... that's amazing ! and now you are thinking about installing a 2.100" Intake Valve , i don't see how a Cylinder Head could have so much metal...
by In-Tech
Wed Oct 13, 2021 5:21 am
Forum: Engine Tech
Topic: What distributor gear are you guys using for billet cams?
Replies: 18
Views: 1222

Re: What distributor gear are you guys using for billet cams?

Put Moly grease or some cam break in crapola on both gears and let them break in together. Fack that metallurgy crap you have been taught. :roll:
by In-Tech
Fri Oct 08, 2021 3:34 am
Forum: Engine Tech
Topic: Dimpling a LS port
Replies: 106
Views: 3906

Re: Dimpling a LS port

Plenty of overthinking/underthinking can go into an air/fuel injection event. The exit coming from the injector? Stream/4hole/5hole and the repulsion from the valve closing...and if you have a plenum or not for it to "recognize" the "mixture". We could talk about this for hours and there is no simpl...
by In-Tech
Fri Oct 08, 2021 3:21 am
Forum: Engine Tech
Topic: Dimpling a LS port
Replies: 106
Views: 3906

Re: Dimpling a LS port

For the record I’m going to test many things on this head many of which come from commenters. I will revisit the dimpling and wet flow with spray and velocities. I don’t know that it will answer any or all of your questions but it will give you info. You can do what you want with it. I have things ...
by In-Tech
Sat Oct 02, 2021 10:48 pm
Forum: Engine Tech
Topic: It's all about the FUEL
Replies: 64
Views: 2752

Re: It's all about the FUEL

Yes, you are correct. The joules are an important factor but can be had in many different variants so spark duration is very important with slow igniting nitro. Hence the need for increased ignition timing so the kernel has time to expand and peak cylinder pressure is still ~15-18 degrees atdc. One ...
by In-Tech
Sat Oct 02, 2021 12:53 pm
Forum: Engine Tech
Topic: It's all about the FUEL
Replies: 64
Views: 2752

Re: It's all about the FUEL

Great fun discussion, one thing I don't see here is ignition. We all remember the Super Mag 3, then when Brian decided to take an electronics class at the local college after work, we got the super mag 4, then 5 and nitro classes got very very fast. Now with the new MSD mags I don't think the igniti...
by In-Tech
Fri Oct 01, 2021 9:24 pm
Forum: Engine Tech
Topic: How to detect a cracked Crankshaft - Video
Replies: 6
Views: 581

Re: How to detect a cracked Crankshaft - Video

40 years ago my balance dude, Johnny O, grabbed my bs steel 427 crank and gave it a ring. It made me curious so I asked. He rang a good steel crank, a good cast crank and one of each that were cracked and I could hear the difference. Also explained to have them wet magged even if they pass the "ring...
by In-Tech
Wed Sep 29, 2021 3:04 pm
Forum: Engine Tech
Topic: Dimpling a LS port
Replies: 106
Views: 3906

Re: Dimpling a LS port

injector placement and as much important is Injector "spray direction" inside Cyl Head Intake Port was worth a lot of HP A machinist friend of mine built his own individual tube injection and used the 90 degree Ron's deflector nozzles with it. He picked up substantial power by turning them to spray...
by In-Tech
Wed Sep 15, 2021 4:22 am
Forum: Offtopic Forum
Topic: My speedtalk friends
Replies: 10
Views: 352

Re: My speedtalk friends

Sorry to hear of this. There is very little anyone can say or do, we'll be thinking of you and yours during this very hard time.
by In-Tech
Tue Sep 14, 2021 6:23 am
Forum: Engine Tech
Topic: Ram induction question
Replies: 11
Views: 722

Re: Ram induction question

IIRC the Dodge was one long ram per head, don't remember a common plenum. It's been a couple days :lol: Runner length is an interesting thing, and as noted by others in this thread, the runner has to be much larger to achieve the same rpm characteristic with more mass flow. When runners are long and...