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Search found 3690 matches

by Belgian1979
Mon Oct 14, 2019 1:44 pm
Forum: Engine Tech
Topic: rocker stud breaking
Replies: 10
Views: 555

Re: rocker stud breaking

Roller rockers. It's not my engine, so I didn't make the choice. I run shaft rockers.
by Belgian1979
Sun Oct 13, 2019 3:03 am
Forum: Engine Tech
Topic: rocker stud breaking
Replies: 10
Views: 555

Re: rocker stud breaking

350 SBC gen I
by Belgian1979
Sat Oct 12, 2019 3:36 pm
Forum: Engine Tech
Topic: rocker stud breaking
Replies: 10
Views: 555

Re: rocker stud breaking

That was my first guess, so I told him to keep the rpms within reason...
by Belgian1979
Sat Oct 12, 2019 2:52 pm
Forum: Engine Tech
Topic: rocker stud breaking
Replies: 10
Views: 555

rocker stud breaking

I had to help a friend today that got stranded with his Corvette. The engine was seriously spitting back through the intake and he put it on the side of the road. I suspected a valve issue of sorts and took of the rocker covers. One of the rockers was lying loose under the right (cyl 8 exhaust) and ...
by Belgian1979
Sat Oct 12, 2019 2:15 pm
Forum: Engine Tech
Topic: Artificial Intelligence to Design Lightweight Parts
Replies: 30
Views: 1039

Re: Artificial Intelligence to Design Lightweight Parts

Only idiots would give machines control over us.
by Belgian1979
Thu Oct 10, 2019 11:30 am
Forum: Engine Tech
Topic: Opinions of guides in import heads
Replies: 19
Views: 702

Re: Opinions of guides in import heads

Well I have Darts and on some valve I can wiggle it. Not huge but definately a noticeable amount with the valves about half lift. I was contemplating taking them off since I still have some amount on smoking on decels. I’m pretty sure this is how they came out of the box but no numbers on actual cle...
by Belgian1979
Wed Oct 09, 2019 3:26 pm
Forum: Engine Tech
Topic: Opinions of guides in import heads
Replies: 19
Views: 702

Re: Opinions of guides in import heads

How do you spot a knock of Dart sbc head from an original ? Personally I have not seen an actual counterfeit but would not be surprised if they are out there. A dart head will say Dart on it and have a Dart part number. The others will have their own part number or no part number at all. And second...
by Belgian1979
Wed Oct 09, 2019 2:54 pm
Forum: Engine Tech
Topic: Opinions of guides in import heads
Replies: 19
Views: 702

Re: Opinions of guides in import heads

How do you spot a knock of Dart sbc head from an original ?

And second question : with the valves in the head, doing a wiggle test : how much wiggle is acceptable and what is not ...
by Belgian1979
Tue Oct 01, 2019 2:04 am
Forum: Engine Tech
Topic: When are you switching to synthetic?
Replies: 79
Views: 3056

Re: When are you switching to synthetic?

Looks all overrated to me.
Although I can see why one would want to change the oil and filter after a few thousands of miles.
by Belgian1979
Fri Sep 27, 2019 2:48 am
Forum: Engine Tech
Topic: about a Nitro cackle engine
Replies: 33
Views: 1775

Re: about a Nitro cackle engine

I can see a situation where at heavy loads and more open throttle the charge in the engine is such that it 'swirls' more when being compressed leading to a more complete burn. I also know that on diesel engines (the common rail variety) they control the engine based on crank speed acceleration and f...
by Belgian1979
Mon Sep 23, 2019 1:56 pm
Forum: Engine Tech
Topic: about a Nitro cackle engine
Replies: 33
Views: 1775

Re: about a Nitro cackle engine

A question came up with what was written. Maybe a dumb question but here goes : how do you control the burn of a nitro charge. I don't know much of a nigfo engine but unless like a turbo diesel engine where you would directly inject into the cylinder in several injection events, I do not see how you...
by Belgian1979
Mon Sep 23, 2019 12:44 pm
Forum: Engine Tech
Topic: Sizing IR Carbs
Replies: 19
Views: 734

Re: Sizing IR Carbs

Yeah, I didn't say 350 c.i., I said SBC. BTW, for a 377" 7,000 RPM engine, DV's IR sizing formula comes up with 57 mm carbs. (But of course GM didn't have a lot of sizing choices short of building their own carbs..) I think I see where this comes from. You're saying 57mm bore size, not choke/ventur...
by Belgian1979
Sun Sep 22, 2019 10:12 am
Forum: Engine Tech
Topic: Sizing IR Carbs
Replies: 19
Views: 734

Re: Sizing IR Carbs

FWIW the grand sports had a 377 ci.
by Belgian1979
Sat Sep 21, 2019 2:48 pm
Forum: Engine Tech
Topic: Sizing IR Carbs
Replies: 19
Views: 734

Re: Sizing IR Carbs

Sure, and so is a 600 CFM carb, but 'more is better'. The SBC engines in the 1963 factory Corvette Grand Sports were fitted with 58 mm side draft Webers. A 58mm will make it nearly impossible to tune it at low and mid range rpm because a small opening will create a lot of airflow at those rpm. So I...
by Belgian1979
Sat Sep 21, 2019 12:06 pm
Forum: Engine Tech
Topic: Sizing IR Carbs
Replies: 19
Views: 734

Re: Sizing IR Carbs

In How to Build Horsepower; Vol. 2, David Vizard gave an IR sizing formula that determines the ideal choke size, which he says should be 72-80% of the butterfly diameter, preferably the latter: choke in mm = √ (CV x RPM/2600) , where CV is cylinder volume in cc and RPM is that of peak power. So for...