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Search found 12426 matches

by MadBill
Thu Dec 02, 2021 10:46 pm
Forum: Engine Tech
Topic: Polishing side beams
Replies: 23
Views: 998

Re: Polishing side beams

Metal Improvement has many facilities around the US and Canada; you could Google the nearest one.
by MadBill
Sun Nov 28, 2021 1:42 am
Forum: Engine Tech
Topic: Polishing side beams
Replies: 23
Views: 998

Re: Polishing side beams

Speaking just to the processes: polish first then peen; the latter produces a compressed surface that resists fatigue cracks.
by MadBill
Sun Nov 21, 2021 2:22 am
Forum: Engine Tech
Topic: Carburetor spacers
Replies: 24
Views: 1355

Re: Carburetor spacers

Square bore carb spacers, specific to single-plane manifolds: Four-hole, and open. What are the benefits/drawbacks of each? You did not mention "cloverleaf" spacers or "tapered 4 hole" or 2 plane "equalizers" or thicknesses ... one or more will usually pick-up but, differently. Finding which one wi...
by MadBill
Thu Nov 18, 2021 11:58 pm
Forum: Engine Tech
Topic: polishing piston rings?
Replies: 26
Views: 1447

Re: polishing piston rings?

With Bon Ami's motto being: "Never scratched yet" how could you go wrong?
by MadBill
Mon Nov 15, 2021 12:44 am
Forum: Engine Tech
Topic: Lowering exh rocker ratio.
Replies: 35
Views: 1318

Re: Lowering exh rocker ratio.

The preceding post applies, but only if the loss is confined to near/at/over peak power.
by MadBill
Thu Nov 11, 2021 12:37 am
Forum: Engine Tech
Topic: 2023 Corvette Z06 LT6 engine
Replies: 13
Views: 796

Re: 2023 Corvette Z06 LT6 engine

1980RS wrote: Tue Nov 09, 2021 11:16 am It's going to be a screamer, can't wait to see one at the track or on the street.
The factory C8Rs have been racing (and winning championships) in IMSA's GTLM class* with this engine since January 2020. (*restricted to 500 HP)
by MadBill
Wed Nov 10, 2021 10:05 pm
Forum: Engine Tech
Topic: MIG WELDING CAST IRON OLDS HEADS WITH CROWN 44-30 WIRE
Replies: 10
Views: 608

Re: MIG WELDING CAST IRON OLDS HEADS WITH CROWN 44-30 WIRE

How about forming steel tongues to match the edge contour of each port pair and welding them to the header flanges?
by MadBill
Fri Oct 29, 2021 1:16 am
Forum: Engine Tech
Topic: Spark Plug Gap
Replies: 28
Views: 1521

Re: Spark Plug Gap

... The posted required firing voltages are based on pure air, not fuel vapor or relative humidity factors. Seems like every engine should have an on-board recording scope. :) In talking to operators of bi-fuel (propane/CNG-gasoline) fleets, they reported that worn spark plugs would misfire thousan...
by MadBill
Fri Oct 29, 2021 1:06 am
Forum: Engine Tech
Topic: Spark Plug Gap
Replies: 28
Views: 1521

Re: Spark Plug Gap

steve cowan wrote: Thu Oct 28, 2021 1:27 am Madbill,
congratulations on the 15000 plus posts so far =D>
To quote Elvis: "Thank you. thank you very much" Steve. :D
by MadBill
Thu Oct 28, 2021 12:23 am
Forum: Engine Tech
Topic: Spark Plug Gap
Replies: 28
Views: 1521

Re: Spark Plug Gap

David Redszus wrote: Wed Oct 27, 2021 7:48 pm...

Let us assume a chamber temperature of 400F and a pressure of 100 psi...
David, is that with or without fuel, as it significantly lowers the voltage requirements?
by MadBill
Mon Oct 18, 2021 4:48 pm
Forum: Engine Tech
Topic: Vacuum rule carb sizing
Replies: 18
Views: 836

Re: Vacuum rule carb sizing

All else equal, carb size has no effect on idle vacuum. What does and is frequently overlooked is idle spark advance. Running say a 15°vacuum advance system could add up to 5" Hg., even with a locked-out advance curve, thereby widening the window of possible camshaft parameters.
by MadBill
Thu Oct 14, 2021 12:13 am
Forum: Engine Tech
Topic: What distributor gear are you guys using for billet cams?
Replies: 18
Views: 1521

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

77cruiser wrote: Mon Oct 11, 2021 9:09 am Doesn't he have an option for a pressed on iron gear?
Yes.
(Whoo, 15.000 posts! Mr. Motofinger strikes again! (I think time's too short to aspire to 20k. :( )
by MadBill
Tue Oct 12, 2021 12:51 am
Forum: Engine Tech
Topic: Reverse Acceleration on Engine Dyno
Replies: 5
Views: 743

Re: Reverse Acceleration on Engine Dyno

It just sounds so cruel; the poor engine straining its guts out as it's mercilessly dragged to its knees... #-o
by MadBill
Sun Oct 10, 2021 12:37 am
Forum: Engine Tech
Topic: Cam Guru Help, Correct lifter to lobe offset & lobe widt
Replies: 16
Views: 2105

Re: Cam Guru Help, Correct lifter to lobe offset & lobe widt

Back in the late sixties I had occasion to resurface the lifters in my 327 Acadian (aka Chevy II). Knowing nothing of lobe taper and/or lifter radius, I did them with a surface grinder. I suppose if the cam hadn't broken soon after and been replaced with a factory Fuelie solid lifter cam I'd have le...
by MadBill
Sun Oct 03, 2021 7:47 pm
Forum: Engine Tech
Topic: Trick flow Double Hump alloy heads
Replies: 33
Views: 2339

Re: Trick flow Double Hump alloy heads

20211003_131504.jpg20211003_121332.jpg20211003_121315.jpg20211003_120951.jpg Flow numbers are without intake manifold The numbers go backwards after 500" lift but the port was not noisy Have not tested exhaust yet hopefully tomorrow. I am scratching my head on one thing- The victor jnr fits real ni...