Search found 791 matches

by mt-engines
Sat Apr 13, 2024 10:40 am
Forum: Engine Tech
Topic: Intake Manifold Porting Show ‘n Tell
Replies: 757
Views: 806989

Re: Intake Manifold Porting Show ‘n Tell

Edelbrock Super Victor 2970, ported at Chopper Air Port. This one is for 400+ cubic inches, running a set of AFR 220s (2.5 sq. in. MCSA, ported by Weingartner), pushing 8000 RPM with 450-500 HP of nitrous... IMG_9610.JPG IMG_9635.JPG IMG_9690.JPG IMG_9691.JPG IMG_9694.JPG IMG_9695.JPG IMG_9702.JPG ...
by mt-engines
Fri Apr 12, 2024 8:15 pm
Forum: Engine Tech
Topic: Intake Manifold Porting Show ‘n Tell
Replies: 757
Views: 806989

Re: Intake Manifold Porting Show ‘n Tell

Cool.. when will you have some results?
by mt-engines
Wed Apr 10, 2024 5:04 pm
Forum: Engine Tech
Topic: 11.5 compression, Iron Head, 91 octane
Replies: 40
Views: 1644

Re: 11.5 compression, Iron Head, 91 octane

To get a better understanding of this situation with stick shift and maybe help the OP. Engine is not yet assembled. What is the better choice in this situation: Leave compression as is and choose camshaft IVC that will help prevent combustion issues but likely shift torque curve up in rpm but make...
by mt-engines
Wed Apr 10, 2024 4:42 pm
Forum: Engine Tech
Topic: 11.5 compression, Iron Head, 91 octane
Replies: 40
Views: 1644

Re: 11.5 compression, Iron Head, 91 octane

Does this use the formula: Static compression ratio + cylinder head material = fuel octane rating? No formula.. 45 years experience. With your experience if he changed to aluminum heads what would the Octane requirements be then? Just ignore him.. his experience is 45 years of regurgitated hearsay.
by mt-engines
Wed Apr 10, 2024 2:27 pm
Forum: Engine Tech
Topic: 11.5 compression, Iron Head, 91 octane
Replies: 40
Views: 1644

Re: 11.5 compression, Iron Head, 91 octane

IMG_0410.jpeg These are the n351 heads on a 4.100 stroke Windsor. I bought the heads used and never poured the chambers until recently, after I invested in the offset shaft rockers and custom header etc. They were supposed to be 64cc but apparently they got cleaned up a little too much. :? I would ...
by mt-engines
Tue Apr 09, 2024 10:04 pm
Forum: Engine Tech
Topic: 11.5 compression, Iron Head, 91 octane
Replies: 40
Views: 1644

Re: 11.5 compression, Iron Head, 91 octane

KnightEngines wrote: Tue Apr 09, 2024 9:20 pm Ouch, manual trans, I probably would want comp closer to 11;1.
Especially with that hot under hood air temps Arizona brings.
by mt-engines
Tue Apr 09, 2024 4:53 pm
Forum: Engine Tech
Topic: 11.5 compression, Iron Head, 91 octane
Replies: 40
Views: 1644

Re: 11.5 compression, Iron Head, 91 octane

Well.. disregard the dynamic compression.. whats important is vehicle weight, gearing, tire size, converter speed. Altitude climate etc.
by mt-engines
Tue Apr 09, 2024 11:19 am
Forum: Engine Tech
Topic: Rod bearing clearance
Replies: 19
Views: 1226

Re: Rod bearing clearance

Hiya Dave, The rods do stretch, my old school blown 11,000 rpm BBC had ~.090" piston to head and you could barely see the very minimal contact. A lot better Alum rods out there now(this was in '94) They do shrink from work hardening. I can't advise on clearances for that stroker as I've not do...
by mt-engines
Mon Apr 08, 2024 12:27 am
Forum: Engine Tech
Topic: Rod bearing clearance
Replies: 19
Views: 1226

Re: Rod bearing clearance

Actually, with that probable 5.300" stroke, I would run minimum .040" rod side clearance and guide the rods side movement within the piston; (piston guided rods); similar to a 2-stroke. What diameter is the rod journal on that crank ? nominal is 2.200 When running at about 7,000 RPM, a go...
by mt-engines
Sun Apr 07, 2024 11:22 am
Forum: Engine Tech
Topic: Rod bearing clearance
Replies: 19
Views: 1226

Re: Rod bearing clearance

mag2555 wrote: Sun Apr 07, 2024 10:27 am I would possibly have doubts about the block,
8K with that stroke!
Dude.... STOP RESPONDING TO ANYTHING POSTED ON THIS FORUM.. YOU ARE CLUELESS!!
by mt-engines
Sun Apr 07, 2024 10:12 am
Forum: Engine Tech
Topic: Mystery sludge
Replies: 19
Views: 1137

Re: Mystery sludge

Probably just soot combined with moly.. E85 is a hell of a detergent,the insides of those engine generally are cleaner from being steam cleaned. I see that on all the E85 stuff I do. Never really concerned me. I've used cheap bulk no name oil in some of them and more expensive lat, redline, gibbs et...
by mt-engines
Sun Apr 07, 2024 10:07 am
Forum: Engine Tech
Topic: Rod bearing clearance
Replies: 19
Views: 1226

Re: Rod bearing clearance

.0032" A little loose for what you are doing. But its fine. .990 .250 wall pin? .0018-.002 is what I would shoot for if you plan to spin it over 8k and make 1700+

Do what you already are thinking . Unless you have a flimsy pin and piston. Im assuming you are keeping this below 8000rpm?
by mt-engines
Mon Apr 01, 2024 9:03 pm
Forum: Engine Tech
Topic: Solid roller spring suggestions please
Replies: 15
Views: 1085

Re: Solid roller spring suggestions please

I have an unknown solid roller cam we are going to try in my Son's sbc 377. Cam specs are 298@.020 266@.050 .445 lobe on the intake, 306@.020 268@.050 .420 lobe on the exhaust. Thinking the shift will be at 7500. 11/32 2.08 / 1.6 stainless valves. We have a rev kit. I have no idea what valve spring...
by mt-engines
Sun Mar 24, 2024 11:54 pm
Forum: Engine Tech
Topic: Cranking compression results are in
Replies: 77
Views: 3171

Re: Cranking compression results are in

I have gone back and read the OP a couple times and don't fully understand what the question(s?) are the OP is asking, so SilverChicken would you read it again yourself and restate your case with a different interpretation, perhaps separate the ideas with paragraphs. I think questions are about the...
by mt-engines
Sun Mar 24, 2024 11:51 pm
Forum: Engine Tech
Topic: Cranking compression results are in
Replies: 77
Views: 3171

Re: Cranking compression results are in

I have gone back and read the OP a couple times and don't fully understand what the question(s?) are the OP is asking, so SilverChicken would you read it again yourself and restate your case with a different interpretation, perhaps separate the ideas with paragraphs. I think questions are about the...