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Mike

L6 Engine Calculator

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is this fairly accurate, or close. or is it just for fun. also a suggestion. why not include, shaving the head on the calculator.

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Not sure if it's accurate or not. It was sent to me by one of the members. I can't remember who it was at this time.

Yes, it would be good to know if it's accurate. I don't think it was put together for fun.. It's meant to be something for actual engine work.

Hopefully the person who wrote it will visit the site and let us know about it.

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It was written by Walter Fath from the Sydney Z-Car Club. I obtained a copy from him August 1998, before it was publicly available & it is my understanding that it's on the money as far as accuracy is concerned.

Bear in mind that you can select invalid combinations (KA24E pistons, L20A rods & L24 block for example) & get very interesting results. Even when using 'wrong' selections, you can still use them as a baseline for pin height, rod length, etc.

I expect Walter is still on the IZCC mailing list, but it's been a while since I've heard from him.

Ben

Adelaide,

South Australia

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this is a great little tool - I'm looking at doing a rebuild, and was impressed to find so much data pulled together in on spot

- agree with a previous comment that another couple of parameters for head and block cuts would make it PERFECT!

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Originally posted by Mike

Here is a very cool L6 engine calculator.

this is a very good program, the programmer must be very good. hopefully whoever the person is, will modify it a little bit to show if a certain combination is not possible. so a less knowledgeable car enthusiast like me will be warned. totally it is a very neat program.

from this program i saw a good combination:

an F54(L28) flat top using L24 rods and 2 mmm gasket gives a 10.19:1 compression. can an L24 rods be use on an L28 block without modification? can a 10.19:1 compression use a regular pumped gas without pinging?

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hf240z,

This combo won't work because the pistons will be above the block @ TDC by 2.73mm. If you use the L24 crank the deck height will be right but capacity drops back to a 2.6 litre.

Always check the deck height when using this calculator, you don't want to be too high or too low with piston deck height.

I just ripped open an L28 with flat tops, P90 head & L24 crank that someone had put together some time ago. Now even if this combo engine had a turbo hanging off the side of it, the compression @ 6.6:1 would still be a little low.

Nick.

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Originally posted by Brett240

just how far out of the deck is too far?

im 99% sure my pistons clear the deck by 2mm...

Hi,

what is your combination?

are you using a L24 rods on a L28 block, piston, crank,head(p90)?

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Originally posted by nixcars

hf240z,

This combo won't work because the pistons will be above the block @ TDC by 2.73mm. If you use the L24 crank the deck height will be right but capacity drops back to a 2.6 litre.

Always check the deck height when using this calculator, you don't want to be too high or too low with piston deck height.

I just ripped open an L28 with flat tops, P90 head & L24 crank that someone had put together some time ago. Now even if this combo engine had a turbo hanging off the side of it, the compression @ 6.6:1 would still be a little low.

Nick.

so is it not possible too if i use a domed piston on an L28 block to increase the compression?

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its an L28 crank with L 14 rods and KA24e pistons with a P90 head, combustion chamber 46cc. problem is the block has been decked so putting those specs in the engine calculator wont be accurate. i know for sure that my pistons clear the block im just not sure how much(from memory 2mm is what it was) this was visible when we rebuilt the engine.

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Originally posted by Brett240

its an L28 crank with L 14 rods and KA24e pistons with a P90 head, combustion chamber 46cc. problem is the block has been decked so putting those specs in the engine calculator wont be accurate. i know for sure that my pistons clear the block im just not sure how much(from memory 2mm is what it was) this was visible when we rebuilt the engine.

hi,

what car has L14 and what car has KA24e. how much compression does this combination make? i am just trying to avoid cutting the head and shimming the cam tower.

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the KA 24 e pistons is out of a Nissan Pintara 4 cylinder. the L 14 rods are out of a datsun 510 that had a 1400cc engine in it. very very rare. i tired to hunt down spares for my engine, searched australia, america and japan for them and couldnt find them.

the L14 rod is longer than the L24 rod.

not sure of the compression of this combo, check the engine calculator, though mine is about 10.2 to 1, both my block and pistons have been decked.

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I should have been a little clearer on this. Dome pistons won't cause any problems, providing they don't hit anything on the way up. What I meant was not to have the crown of the piston too high or too low (that's the outer edge of the piston).

Brett, I cant see how your pistons are not hitting the quench area of the P90 head without having allot of chamber opened up or a thicker head gasket?

You're certainly on the right track though, the bottom end combination is a good one but don't like those pistons, especially when they are poking out the top like that. I would have gone with a lighter & shorter skirt design piston like the SR20, VG30 or even RB30. These allow for less friction & reciprocating mass, & we all know what that means, less drag in the engine & quicker revs. But you have already achieved most of this Brett by using the longer rod.

152kw@wheels ain't bad at all.

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yeah i thought that would cause a problem too. walter fath built the engine originally with an e88 head and a spacer plate, when i changed to the P90 from memory the words F%$#*ng close were used here. but it all bolted together ok and runs fine. the head gasket is a standard thickness graphite gasket.

ive been thinking about different slugs for a while whats the pin height and diameter on a VG30 piston?

ill do a check on that piston/deck height again

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G'day all adding to this forum, I just purchased a 1982 Mark 2 280ZX 2+2, bare metal project and the engine is an L24 the head is N42 the injectors are all 280ZX Mark 1 with Mark 2 ECU and airbox.

L28 670741 was removed and block number L24 458640 was fitted.

N42 head casting is apparent and all the injector stuff refitted less some bypassing for LPG.

The car runs on both fuels at the flick of a switch, ULP and LPG and has been worked on as all the welsh plugs are bright new cad-plated and engine was fitted in 2000.

We haven't started it yet as car is in respray but unable to contact the previous owner how can we sus out what this engine is configured like. ???

I guess we do compression check

(What numbers are we looking for in comp pressures).

We might be able to remove the sump and do a stroke and bore without distrubing things.

Also this engine has an ENZED oil loop with a high pressure braided hose lopping in and out of the engine from the block, from just above the sump gasket.

What L24's had oil cooling fittings? What car is this sucker off, we can't find any 240Z's or K's or C's that ran oil coolers..?

This one is bypassed so what should we use for oil cooling?

How large an oil cooling radiator is required, where do we get one, what pressure is required to be withstood and where best to mount it on a 280ZX??

Thanks :classic:

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