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Location:
Adelaide
Registered:
July 2004
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k engine punishment
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Mon, 15 November 2004 10:21
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hey, just wondering if anyone knew how much the k series engines could withstand? eg. max revs, boost etc... Any experiences or modifications would help.
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Location:
Hackham South Australia
Registered:
July 2004
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Re: k engine punishment
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Mon, 15 November 2004 11:21
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quite a while ago round jan \ feb i had a worked 3K in a KE20. The motor was on egde, couldn't tell u the specs coz i didn't build it but from a guess and what my bro told me when he pulled the motor down for inspection, it was running 10.2 CR (Lonsdale Cylinder Heads had a final go) with balance bottom end and 4K head. Head was worked: ported, polished, and hardened valves, stem and seats. The head was shaved to minimum. The combustion chambers were filled in as much as possible. The little bastard never valve bounced either.
From a guess the Cam was somewhere around stage 2 if not more towards race specs.
It ran a 32mm down draught weber and extractors with a 1.75" straight through exhaust.
Both the manifold, the extractors and the head were port matched.
The archillies of the motor was the fact that is ran standard pistons and rings.
The lil car ran a 4 spd. 1st = 50km\h 2nd = 95km\h 3rd = 130 km\h and i pulled 170 in 4th and the car still was making power.
Oh yeah from a guess it was making power past 9000RPM.
It was a credit to its builder. Unfortunately the motor made power far past the point of no return.
This was the best NA motor I ever had.
I would recommend building a motor that has atleast forged pistons and decent rings with the simular of above.
As for boosting the K motor a guy from Advance wreckers (commodore wreckers) used a 5K BE (bottom end) with a 4K head, some how it becomes decompressed somewhere near 7.5:1. I used sold lifters and a custom cam. He said the thing ran 25 PSI without a hitch.
If you want a cheap decom K motor then use a 4K head on a 3K BE, that should lower it enough to run wild boost.
Hope that will help.
Dale J.
[Updated on: Mon, 15 November 2004 11:22]
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Location:
Canberra, ACT
Registered:
September 2002
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Re: k engine punishment
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Mon, 15 November 2004 12:45
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I've heard rumours from multiple sources now that some of the clubman/sport1300 guys used to run them well past 10000rpm, though with short engine lifetimes!
To do this I'd assume that they used roller rockers (Datsun A12 items might possibly fit with few mods - the heads are *very* similar to K items), bigger valves with thinner (6mm ish) stems as specified by the 3K TOSCO manual, hard-as-my-wang valve springs, stronger bolts/studs everywhere, ridiculous cams, and some big carbs. Aforementioned TOSCO manual says to use a pair of DHLA45 sidedrafts. QUITE big.
Stewie's 4K makes power well beyond 8000rpm. His cam specs are in the oldcorollas faq
I'm not planning to regularly run my warm 3K past 7500, at least not for a while. Will see how it goes with the new twins
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Location:
Brisbane / Gold Coast
Registered:
May 2002
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Re: k engine punishment
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Mon, 15 November 2004 13:41
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| indigoid wrote on Mon, 15 November 2004 23:45 |
I've heard rumours from multiple sources now that some of the clubman/sport1300 guys used to run them well past 10000rpm, though with short engine lifetimes!
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Not very many people got them to run above about 9,000rpm with any success.
Mine ran to about 8600rpm and lasted about a season before needing a rebuild. That was about three hours running!
Rebuilds cost about $2000 - $3000, and the engine made about 140hp odd.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: k engine punishment
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Mon, 15 November 2004 13:52
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Bill, wouldn't happen to have a light steel or alloy flywheel lying around would you?
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Location:
Brisbane / Gold Coast
Registered:
May 2002
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Re: k engine punishment
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Mon, 15 November 2004 14:22
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| oldcorollas wrote on Tue, 16 November 2004 00:52 |
Bill, wouldn't happen to have a light steel or alloy flywheel lying around would you?
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That's right, I wouldn't. 
FWIW a Suzuki G13B flywheel is very close to bolting straight on.
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Location:
Adelaide
Registered:
July 2004
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Re: k engine punishment
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Tue, 16 November 2004 02:38
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thanx people, your info has been very helpfull. Wouldnt a engine running boost need things like thicker/harder head gaskets? I heard a stock 4k can run 8psi, anyone know the truth of that? I was planning installing an sc12 charger, is why im asking.
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