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mikec(nz)

240k Race car - GTR tribute

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Oh well I suppose it had to happen sooner or later. The engine I got with the car which was a bit 2nd hand decided to give up at the recent GTR festival.  Only got two laps before it started overheating.  Not too bad after 3 years hard racing.  Diagnosis blown head gasket.  We expected that as it had been showing signs and we just keep patching it up.

So we decided new head gasket and maybe rings/bearings ...... but turns out it is too far overbored to give it even a hone and the head is to soft to last much longer - so time for a new engine.

 

Happy to post pics etc as we do it - but only if there is interest.  Most online forums are dead these days and I can't be bothered with facebook.  So post here if you want to see pics of the engine build - heres a teaser

 

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Facebook throws data into a long scroll..... like toilet paper......try to find that interesting link you saw a month ago.

 

When will the masses realize it is toilet paper programming?

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Well the plan was to just a simple freshen up, but that is not going to work. Engine out

and inspected.

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The block was already bored to around 89mm so after sonic checking, we could not even get a hone, the leaking headgasket has scoured the bores.

So luckily found a fresh unmolested block (thanks Don - who sold me the car for letting me have one out of his collection).  This is currently off being linebored and we are going to reuse the deisel crank and 260Z rods as they are in good shape.

We are going to put in forged pistons, but waiting on some calcs before deciding how much to bore as we will be running around 10:1 compression.  I run the car on Av-gas (aviation full 100octane) so there is no reason to not up the compression.

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The old sump is looking a bit sad as it has been modified a lot of times and the exhaust headers are rusted out from running the leaded gas (and their ten years age).

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So had my first delivery from Japan. new exhaust manifold, new clutch and had the starter motor and alternator rebuilt.

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Next .... finding a head and .....

Edited by mikec(nz)
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Bought a NOS head from this site, thanks so much Garrett (inline6), its a P90 so will require a bit of work to get high compression but great place to start.

Managed to buy NOS lifters and related parts from Nissan Japan and some Valves and retainers from Kamaeri.

And i turns out the Hakosuka sump fits the Kenmeri, so got one of those with a kit that ties into the gearbox.

But looking at the existing crank and rods and doing some maths, looks like will they will have to replaced.  Can't bore the new block too much so going to limited a bit in capacity 87mm = 2960, but it should be able to rev.

So the head is off to Horsepower heads (Kevin Bann ex Kelford Cams) who is starting on the port work.

This build is going to take a bt longer than planned but the end result is going to be better than expected, so will be updating shortly.

 

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Will do, just waiting patiently (not really) for the new crank, rods and piston from Kameari.  Unfortunately Christmas has delayed things.  But will post pics as soon as they arrive.

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Just some pics, we have done some major head work which will discussed soon. Also upgrading the rear stub axles to 260z. More info soon.

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Head Work Done

Weld combustion chambers and Straighten head and re machine front and back.

Then Weld injector holesand CNC porting 1head

Then from Kevin Bann - Horsepower heads - "Write intake and exhaust programs to suit the build specification. The intake port is sized to 'choke' at 9000 rpm and provide peak torque at around 6000 rpm. I had to move and skew each intake program individually to line up with existing manifold. A lot of re-welding and re thinking the chamber because of the different chamber roof heights between this head and the old head. I ended up buying deeper valve seat inserts and lowering the chamber roof to gain compression while retaining flow past the valve. This will keep a stronger deck in the head as not so much needs machining off it versus keeping stock valve height."

Then Supply 12 extra deep valve seat inserts, machine and fit CNC machine valve seats and Surface grind head 1.6mm

Then we found the P90A head had hydraluic lifters which you can no longer source.  So bugger, but bought some inserts and fitted the stock solid lifters.

Just got in some 3.5mm lash caps from Kameria and now we can get the final cam grind done.  Heads should now be done in a couple of weeks,  Bugger my engine builder is in holiday in Europe.

We decided to fit the 260Z stub axles while waiting as they are a weak point.  Supposed to bolt straigh in!  Well maybe for the 240Z but definately not for the 240K.  Well thats another story.

 

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Specs are 228cfm at .550" lift - Chambers are 38cc - compression hopefully around 11:1

Edited by mikec(nz)
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That's some cool head work! Hard to find people who can handle that kind of work.

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Yeah that's the cool thing about New Zealand(NZ) miles away from anywhere but some real talented motorsport people. Bumped into a guy just the road last week, he had a full CNC machine just in his shed for afternoons hobby work. Kelford Cams is also in NZ some of the top cams in the world. My head guy Kevin Bann worked for them for years. Now he has his own business Horsepower Heads, the cams are being worked on at the moment by Kelford Cams. There are five dynos within 20 minutes of me, three of them are dynapacks (also made in NZ) and one is my brothers LOL. We have two race tracks within 2 hours drive and it goes up to four if you want to drive another hour or two. We have rules that provided your race car is safe and can pass a warrant of fitness you can drive it on the road. I think I should stop now :) before I start raving on about Bruce McLaren and John Britton etc

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Well been a few delays and a few dramas. But finally the new engine is all together and back with my mechanic.

We have to modify the sump, tweak the extractors/headers and make up new front pulley, but should be done this side of Christmas.

Couple of pics to keep the interest going.

Cheers Mike 

 

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Progress is slow, but should be starting next week, at least progressed to engine stand ?

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Edited by mikec(nz)
Stupid speelcheck
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More progress pics. Had to modify cross member to fit sump, will need swaybar redesign. New front pulley set up underway. Sump will be off next week to add trapdoors and windage tray and connectors. Will be putting in new bigger oil cooler. Shes well underway. Lots of swearing and moaning by my mechanic so that must be a good  sign  of progress. 

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New engine mounts arrived today.  Wow they are hard to find and not cheep.

Getting the sump modified this weekend and probably will need a new exhaust.  The Aviation Gas just chews them out, especially when sitting for over a year :(

Should not be long now.  Cross member is modified, custom pulleys are due to arrive next week, just need a few things from the Zstore and we might be ready for a start up.

 

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Hey Mike,

Great to see the updates.

I was on this forum years ago when I had my first 240K coupe. It seems there has not been a lot of action on here for years. 

I sold a few bits to other K owners in Oz though this site. I have not been on here since the site got updated and stumbled on your post. I even sold you a few bits years ago.

Turns out it took me years and my current one cost 10x my first one but I found another in NZ (This time a JDM Skyline C111 Coupe) which I am keeping.

Keep up the good work!

Edited by Flauski

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