Pushrods and timing belts

"V8Demon - Prefers Autos for drag racing. Fite me!" (v8demon) 04/21/2016 at 15:38 • Filed to: None

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I am sure there are engines that are of the OHV configuration that use a timing BELT as opposed to a chain. I can’t think of any off the top of my head....

Enlighten me. Bonus points for V6 and V8 engines with a belt....

cletus44 aka Clayton Seams > V8Demon - Prefers Autos for drag racing. Fite me! 04/21/2016 at 15:46

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Why bother? Chains that short don’t really stretch and belts need to be changed more frequently

JRapp: now as good as new again > V8Demon - Prefers Autos for drag racing. Fite me! 04/21/2016 at 15:48

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The 3.7L V6 on my Acura MDX is SOHC (but with VTEC yo) with a timing belt.

EDIT: Read the OHV as OHC and was gonna say there should be tons of them... never mind.. so in otherwords, you’re looking for belted pushrod engines?

Milky > V8Demon - Prefers Autos for drag racing. Fite me! 04/21/2016 at 15:49

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You sound like you want a belt, but why?

Die-Trying > V8Demon - Prefers Autos for drag racing. Fite me! 04/21/2016 at 15:49

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small block chevy belt conversion by jesel

jimz > V8Demon - Prefers Autos for drag racing. Fite me! 04/21/2016 at 15:50

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none I’m aware of from the factory. the timing chain in OHV engines has almost always been in an oil-wetted zone, and most types of rubber are rapidly destroyed by oil and other petroleum liquids.

there are aftermarket ones like the one in your picture, but they require a different front cover.

now, the Ford 1.0 3 cylinder (both Ecoboost and normally aspirated) uses an oil-wetted timing belt, but that’s still an overhead cam engine.

jimz > Milky 04/21/2016 at 15:56

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belts are quieter and cost less, at the trade-off of longevity.

AfromanGTO > Die-Trying 04/21/2016 at 15:57

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Why?

Busslayer > AfromanGTO 04/21/2016 at 16:11

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A timing belt conversion makes cam swaps easier as well makes adjusting cam timing easier. They also have some advantages at high rpms where a chains sometime get weird harmonics that can cause cam timing issues at higher rpms.

DrScientist > V8Demon - Prefers Autos for drag racing. Fite me! 04/21/2016 at 16:19

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the v8s in porsche 928s use timing belts.

and are also interference engines, so the health of the belts is critical.

edit... misread your question. thought you were looking for v8 ohc engines with belts.

RamblinRover Luxury-Yacht > V8Demon - Prefers Autos for drag racing. Fite me! 04/21/2016 at 16:24

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There’s no reason for OHC engines to have belts OR chains. Let alone OHV.

Note: that was a joke. Not every engine should go batfuck crazy with gears because not every engine is an antique F1 engine.

Rykilla303 > V8Demon - Prefers Autos for drag racing. Fite me! 04/21/2016 at 17:02

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Ford 2.3 Lima - 4Cyl (rangers, pintos, mustangs, EXP)

V8Demon - Prefers Autos for drag racing. Fite me! > Milky 04/21/2016 at 17:13

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Plain curiosity. Nothing more. I prefer chains for durability. My Dodge Nitro is the only car with a belt (4.0 Sohc V6) and calls for change at 100k miles. I have 79k on it now.

AfromanGTO > Busslayer 04/22/2016 at 12:05

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Cam swaps aren’t that bad to begin with as long as the radiator is out. Why not go to timing gears so you never have to worry about it wearing out, or any rpm issues.

JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t > V8Demon - Prefers Autos for drag racing. Fite me! 05/04/2016 at 11:37

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cheating a little.... but how about a single overhead cam engine with a timing belt and pushrods? May I introduce to you the Alfa Romeo “Busso” V6, in it’s original SOHC, 12-valve configuration.

the large valves and hemispherical combustion chamber design, with central spark plug, necessitated a very wide head, but for packaging, weight and cost reasons the original design compromised/innovated/tapped-mad-Italian-engineering-genius with a SOHC (driven by a belt) that actuated the intake valves directly, and also short, lateral pushrods that crossed the wide head to actuate the exhaust valves. Later (in the late ‘90s), when 24-valve heads were fitted, the engine became DOHC with separate exhaust and intake cams on each bank.

V8Demon - Prefers Autos for drag racing. Fite me! > JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t 05/04/2016 at 11:56

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So if I’m reading this correctly, it has one camshaft in only one of the heads? I’ve been up for almost 24 hours now so of I’m way off, you know why...

JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t > V8Demon - Prefers Autos for drag racing. Fite me! 05/04/2016 at 12:33

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get some sleep.

It has one camshaft per head (v6, therefore two heads), which actuates the intake valves directly (at the inside of the V) and there are pushrods (actuated by the single cam) that go across the head to actuate the exhaust valves on the outside of the engine

V8Demon - Prefers Autos for drag racing. Fite me! > JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t 05/04/2016 at 21:46

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Ahh OK. Yeah, my brain was baked after getting home from work and dealing with an oil gauge that reads zero PSI when the.motor is actually putting out what it’s supposed to.

That’s a little bit of EVERYTHING. Very cool.