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Search found 1614 matches

by peejay
Thu Sep 24, 2020 12:42 pm
Forum: Engine Tech
Topic: Are clearances actually tighter now?
Replies: 22
Views: 963

Re: Are clearances actually tighter now?

Aluminium blocks have made cold clearances smaller than they once were with cast iron. Improved piston design has enabled the OEMs to tighten clearances there, sadly it's often lost with dumb and lazy after market ones. Go read an internet available workshop manual on an S2000 engine, Honda were ru...
by peejay
Mon Sep 21, 2020 4:31 pm
Forum: Engine Tech
Topic: Are clearances actually tighter now?
Replies: 22
Views: 963

Re: Are clearances actually tighter now?

Most modern engines have the blocks and cranks and rods marked with letter codes. These codes represent differences as small as one ten thousandth of an inch. Then you choose your bearing shells based on that. Some engines have piston clearance close to zero. Some older Subarus allowed negative clea...
by peejay
Mon Sep 21, 2020 4:22 pm
Forum: Engine Tech
Topic: Quiet external EFI fuel pump experience
Replies: 26
Views: 570

Re: Quiet external EFI fuel pump experience

The cheapo $90 Summit EFI pumps are pretty decent.

Or you can buy the same thing from Rock Auto for an older 7.3 F350 for about $35-40.

They should flow enough fuel for 400hp. You can run two in parallel. Mount them in rubber to the frame, you'll never notice them unless the engine isn't running.
by peejay
Mon Sep 14, 2020 7:34 pm
Forum: Engine Tech
Topic: Why no Ardun hemi head SBC conversion?
Replies: 48
Views: 1459

Re: Why no Ardun hemi head SBC conversion?

they hacked a third off Makes it sound like actually shortening the parts will do it. Completely different crankshaft: V12 is usually either a 60° block, or 90° block + 30° pin offset, V8 is usually a 90° block. Of course they would rejigger the cam and crank ordering. But it was a 60 degree engine...
by peejay
Sun Sep 13, 2020 4:17 pm
Forum: Engine Tech
Topic: Modifying an LS 5.3 Head for Towing
Replies: 22
Views: 626

Re: Modifying an LS 5.3 Head for Towing

You can't really compare intake ports by CC across different engine families because the ports are going to be a lot different. A port with half the CSA but twice the length in the head is going to have the same CC. That said, I've never run out of power towing with a 4.8 in an extended cab 4x4, or ...
by peejay
Sun Sep 13, 2020 1:55 pm
Forum: Engine Tech
Topic: Why no Ardun hemi head SBC conversion?
Replies: 48
Views: 1459

Re: Why no Ardun hemi head SBC conversion?

The story I heard, was that at the start of WW2, some of our smaller tanks were built with the flathead Ford V8, and that more power was needed because of the weight of the tank. The Ardun heads evidently took care of that problem. Ford built a 1,000ci hemi engine for tanks in WWII. It was a DOHC, ...
by peejay
Sun Sep 13, 2020 1:45 pm
Forum: Engine Tech
Topic: oilless engine
Replies: 17
Views: 853

Re: oilless engine

Guys, A question that pertains mostly to engines that drive generators: would it be possible to build an internal combustion engine, especially working on diesel fuel, that would not need oil to lubricate the crankshaft, camshaft, rods etc. ? I have heard (once upon a time) that GM/Opel had been ve...
by peejay
Sun Mar 22, 2020 7:05 pm
Forum: General Tech
Topic: E85 - use it to sanitize stuff!
Replies: 5
Views: 892

Re: E85 - use it to sanitize stuff!

HELL no!!! I tore down an E85 turbo engine that had blowby issues once, without gloves on. Got the mother of all headaches after working with the gloopy oil that was all over the internals. Ever since then, the smell of E85 exhaust or even just the fuel itself makes me gag! I can wash things in gaso...
by peejay
Sun Mar 08, 2020 2:03 pm
Forum: Electric & Hybrid Vehicle ** NEW **
Topic: Wow , diesel cars and light diesel vehicles banned in Europe!
Replies: 27
Views: 4236

Re: Wow , diesel cars and light diesel vehicles banned in Europe!

You think the left wing kooks will embrace that? ?? Not a chance, they will attack all that technology as harmful to the planet, no pesticides, no big scale farming, no no no They want organic natural farming... so the food they consume makes them feel more moral 🤪🤪 One day the left will try shutti...
by peejay
Sun Mar 08, 2020 11:09 am
Forum: Electric & Hybrid Vehicle ** NEW **
Topic: Wow , diesel cars and light diesel vehicles banned in Europe!
Replies: 27
Views: 4236

Re: Wow , diesel cars and light diesel vehicles banned in Europe!

Agbots, Farmbots. https://interestingengineering.com/9-robots-that-are-invading-the-agriculture-industry You think the left wing kooks will embrace that? ?? Not a chance, they will attack all that technology as harmful to the planet, no pesticides, no big scale farming, no no no They want organic n...
by peejay
Sun Mar 08, 2020 11:06 am
Forum: Engine Tech
Topic: What SBC do you like best?
Replies: 46
Views: 4451

Re: What SBC do you like best?

None of 'em, they don't accelerate, and the head bolt pattern causes all sorts of problems with ring seal unless you like putting your machinists' kids through college, and the blocks are made out of peanut butter.
by peejay
Sat Mar 07, 2020 6:08 pm
Forum: Engine Tech
Topic: Just thinking out loud is all??
Replies: 9
Views: 1106

Re: Just thinking out loud is all??

Someone posted a ways back some cylinder pressure charts for a high compression naturally aspirated engine vs. a lower compression engine with boost. I think it was in response to the idea that an 8:1 engine with 15psi makes the same cylinder pressure as a 16:1 engine? The boost and lower compressio...
by peejay
Sat Mar 07, 2020 6:02 pm
Forum: Engine Tech
Topic: 307 Chevy with Vortec Heads
Replies: 18
Views: 2101

Re: 307 Chevy with Vortec Heads

Bore should be fine, 305s had smaller bores
by peejay
Sun Mar 01, 2020 8:49 pm
Forum: Engine Tech
Topic: Just made a sump. How do I seal the weld leaks?
Replies: 28
Views: 2971

Re: Just made a sump. How do I seal the weld leaks?

I have seen oil pans pass the kerosene test on the bench for hours, but weep oil on the engine. Not sure if vibration caused them to crack, or the crack was already there but didn't leak when stationary. I have re welded them with success. If you want to do the job only once, use a sealer like the f...
by peejay
Sun Mar 01, 2020 8:47 am
Forum: Engine Tech
Topic: itb balancing method question
Replies: 40
Views: 2389

Re: itb balancing method question

I disagree with the comment to balance carbs at ~2-3k rpm. You want them synchronised/balanced at idle so that at small, off idle throttle openings where you would be cruising, airflow is even to prevent surging. At 3000 rpm, the difference in airflow because of the greater throttle opening will be...