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Search found 241 matches

by Roundybout
Fri Nov 08, 2019 1:12 am
Forum: Engine Tech
Topic: another balance question
Replies: 11
Views: 608

Re: another balance question

My biggest concern would be going to a heavier piston and a thinner wall pin. The weights involved in how it will balance out is secondary. I’m assuming a drag race application and 9400 RPM is at the shift/stripe. I’d talk to the piston/pin manufacturer for some possible guidance. If the current pis...
by Roundybout
Fri Oct 18, 2019 10:29 pm
Forum: Engine Tech
Topic: 406 sbc build on the cheap
Replies: 3
Views: 386

Re: 406 sbc build on the cheap

That’s asking a lot from an OEM 400 block. The good thing is it’s going into a mud truck so hopefully it’s not going too fast when it drives over the lower end. That being said I’d put the 1.6 on the intake. 1.5 on the exhaust should be ok for what you’re looking to do.
by Roundybout
Tue Oct 08, 2019 8:08 pm
Forum: Engine Tech
Topic: Small diesel engine turbo selection help.
Replies: 14
Views: 489

Re: Small diesel engine turbo selection help.

Thank you all for the replies. I just sent Garrett an email. I’m thinking this might work for me: http://turbochargerspecs.blogspot.com/2013/03/garrett-gt06-gt0632sz-32-trim-80-hp.html?m=1 The size of the turbine wheel compared to a quarter is something else. Able to support 80HP is even more unbel...
by Roundybout
Sat Oct 05, 2019 7:22 pm
Forum: Engine Tech
Topic: Small diesel engine turbo selection help.
Replies: 14
Views: 489

Re: Small diesel engine turbo selection help.

Try looking for a turbo from a snowmobile (400cc-600cc).

There are also tons of crap Chinese turbos on amazon/eBay to tinker with that are cheap enough to justify IMO.
by Roundybout
Tue Sep 17, 2019 11:16 pm
Forum: Engine Tech
Topic: Are Exh pushrods more stressed even in NA applications?
Replies: 35
Views: 1363

Re: Are Exh pushrods more stressed even in NA applications?

Is the fact that the intake valve is chasing the piston on the way down compared to the piston chasing the exhaust valve on the way up a factor on exhaust valve lift? It’s easier to get air flow out of an engine than in. You’ve only got atmospheric pressure and whatever resonant tuning helping to ge...
by Roundybout
Sat Sep 14, 2019 11:00 pm
Forum: Engine Tech
Topic: Engine rules?
Replies: 10
Views: 857

Re: Engine rules?

Are there separate rules for Ford? Sounds like if you showed up with one you’d make whoever wrote those rules head spin.
by Roundybout
Sat Sep 14, 2019 10:52 pm
Forum: Engine Tech
Topic: What happen
Replies: 27
Views: 2117

Re: What happen

That almost looks like pre-ignition damage. Can you have pre-ignition without detonation? Is this an injected engine? Something wasn’t happy in that cylinder causing a lot of heat. What’s the underside of that piston look like?
by Roundybout
Sun Sep 01, 2019 1:33 pm
Forum: Engine Tech
Topic: It runs faster on low octane fuel?
Replies: 31
Views: 1569

Re: It runs faster on low octane fuel?

We keep a good amount of pump fuel on hand for mowers, dirt bikes, generator ect. and it sometimes doesn't get used up for 3-6 months. Never had an issue in the summer with starting, running or any fuel related issues. Only use ethanol free fuel so that might have some bearing on it. I have noticed ...
by Roundybout
Sun Sep 01, 2019 1:25 pm
Forum: Engine Tech
Topic: Erratic Oil Pressure
Replies: 11
Views: 671

Re: Erratic Oil Pressure

Anything changed at all to account for the issue? Possibly a different oil or filter? I'd confirm the issue with a different gauge then look at the supply side to the pump. Where are the scavenge sections located? I'd imagine what makes it back to the sump tank would not have too much air entrained ...
by Roundybout
Wed Aug 21, 2019 7:48 pm
Forum: Engine Tech
Topic: SBC tall deck block rod length
Replies: 1
Views: 185

Re: SBC tall deck block rod length

I'd keep the 6.250 rods if you're buying pistons anyway. Piston will most likely be a little lighter too than the 6.0 rod combo. The 6.0 combo might give a bit more leeway on ring package placement if using nitrous or forced induction but isn't a concern here.
by Roundybout
Sun Aug 18, 2019 3:01 pm
Forum: Engine Tech
Topic: Spark plugs- ground strap”tech”?
Replies: 35
Views: 2035

Re: Spark plugs- ground strap”tech”?

That's a new one to me. I couldn't imagine such a small hole/s would stay clean and not clog up with combustion by-products after a while. Not to mention how that would help, at all. Only thing I've ever seen work "better" is indexing them. And that's for clearance with maybe a small side benefit in...
by Roundybout
Fri Aug 16, 2019 11:51 am
Forum: Engine Tech
Topic: Dry-sump S.B.C / wrist pin oiling
Replies: 9
Views: 495

Re: Dry-sump S.B.C / wrist pin oiling

I was just reading a blog by JE on this very subject. https://www.google.com/amp/blog.jepistons.com/wrist-pin-oiling-styles-explained%3fhs_amp=true I like the DLC coating and forced pin oiling via the oil control ring on an endurance application. Drag engine I believe you could get away with a DLC c...
by Roundybout
Thu Aug 15, 2019 9:44 am
Forum: Engine Tech
Topic: Rover V16
Replies: 9
Views: 583

Re: Rover V16

The rigid joining of the crank/cam is the biggest hurdle I believe. That's one long crank and cam. Hanging a fluidampr off the front is a tall task for it. Got to treat it as one long componate though so as rigid as possible. Thinking out loud widdle a one piece billet crank down to where you want t...
by Roundybout
Thu Aug 15, 2019 7:58 am
Forum: David Vizard forum
Topic: 1000 Hp 632 for street - possible or no?
Replies: 11
Views: 644

Re: 1000 Hp 632 for street - possible or no?

What's the intended application? Strictly race or are we intending to drive this on the street a bit? I've gotten lazy in my old age and I'd just throw a turbo or two on it. :wink: