filfrederick
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Everything posted by filfrederick
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my thoughts exactly! have you been reading my secret corolla diary?
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I had a lot of trouble with starter motors not being up to the task of turning this puppy over I tried rebuilding a stock one and it would not even crank, so I went out and bought a brand new 1.2 KW replacement starter and it was ok, but still cranked very slowly and I somehow snapped the nose cone clean off. So I now use a starter from a V8 landcruiser and it is amazing! Cranks so fast, and not too difficult to make it fit, I just had to machine up an adaptor plate Almost ready for japnats!
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Not quite that simple... for $6k you can have mine...
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each piston would need different relief locations, because the bore spacing on the head is different to the block. also if i did it again i would weld the sides of the combustion chambers and re-shape them so they matched the block a bit better. and without the extra capacity from the overbore the combustion chamber would need to be smaller to get the same compression ratio, or perhaps just strap on some sort of forced induction?? it would be a wild 4k! my main mistake was doing everything a bit halfarsed to see if it worked then leaving it. i think with some forged pistons, dry sump and a metal headgasket it would be a lot better. Now that i know it will actually run.
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- 3k-r
- 4k twincam
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glad to help. yes I think they would, it would also be hard to get high compression with 4k pistons, and piston-valve clearance would probably be an issue.
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Also found this video from up at lakeside, very poor quality but at least you get the noise!
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I was looking through my photos of when i built the engine, but unfortunately I did not take any of the head work. but i can tell you that it was actually quite easy to actually fairly easy to get the 4age head to bolt on, it was just a matter of using the 4k head as a jig and slotting the original head stud holes in the 4age head to suit the 4k block and as they were fairly close to begin with they only had to be moved a few mm. The water galleries were not a problem and did not need to be changed but all the original oil drains and feed were not compatible so were blocked and converted to external. in this pic you can see the brass fitting under the exhaust cam/ above the water pump that is the new oil feed to the camshafts. here you can see the main oil drains for the head with the big red hoses attached, the lower right one is original 4age but because it is on the high side i machined a hole through the back of the head and made the alloy block with the fittings to bolt on for an extra drain and breather. there is another small drain under the distributor mostly to make sure no oil sits in the head
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is there anything in particular you want to see?
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Yeah that was me, i work just up the road. your ke looked nice too.
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I think i recall os-giken selling their twincam L heads for around AU$30000 and they made about 30 of them i would recomend modifing an existing head. even then the twincam 4k i built would have cost about $11000 if i was paying for labor. just to give you an idea. Phil
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the engine has been much better than i expected, it has been super reliable and have not had any real issues with it. development is still continuing currently upgrading to provide more power/driveability - clutch as the standard one was slipping as soon as the motor came on to cam. - carbs, swapping out the cv's for a set of 39mm keihin flat slides, should make a massive difference up top. - cam drive, swapping from the square tooth belt to a round tooth so i am able to run 4age vernier pulleys to make tuneing easier - gearbox, decided on sticking with the k50 but building a pneumatic actuation system to control gearchanges and clutch. so it will be able to do flat up changes, not sure on the controller yet but will be paddles or a foreward/back leaver. as for the 5k idea, it would make some things a little easier, but you would still have to use 4age pistons to get the compression ratio up and provide clearance for the valves. and then you still need to deck the block to make up for the difference in pin heights between 5k and 4a pistons. you would probably want to run the late model pistons too as they have a higher piston crown, so then you will need to use 4a rods to convert from 18 to 20mm gudgeon pins. i suppose you could use some aftermarket, high compression big port pistons to keep the 18mm pins and use 5k rods, but would be significantly weaker. machining wise, i did all mine myself, i work at Mendham Engineering so we could do it all but its a lot of work and not cheap hope that helps Phil
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Not that i wish to contradict anyone, and i can only talk from my personal experience when building my twin cam 4k. but.. using a normal car block (not a forklift) i sonic tested the block before i started and the walls were uneven side to side, and front to back by .25mm to 1.5mm so by repositioning each bore to the centre of each individual casting i was able to bore the block to 81mm while retaining a 3mm minimum wall thickness. the absolute minimum wall thickness i would go would be 1.5mm but it would crack eventually. maybe i stumbled upon a freak block, I'm not sure but, it can certainly cam be done and i have been driving mine for 3 monthe with no problems. hope this helps answer some questions -phil
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the rolla is almost ready for sunday! cams in and tuned enough. wasn't able to finish my wheels so i will rolling on sportmax see you all there come and say gday phil
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June 19Th All Jap Classic Day Brisbane
filfrederick replied to Undertaker_is_the_best's topic in QLD / Brisbane
i will be there for sure in my contraption -
my new cams should arrive next week! 294 8mm lift its going to be peaky. think i will head up to lakeside sunday to watch the open wheelers sunday, apparantly there is a 130hp 3k powered one.
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i bored out my 4k to 81mm but i sonic tested it and had to reposition the bores but i still have about 120thou wall thickness.
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No, I sonic tested the block before I started and just moved each bore around by a few mm just to get them in the middle of the casting so there was even wall thickness. I couldnt have bored them out as much as I did without relocating the bores.
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haha yeah that rob weirdo follows me around all the time, i think he wants to pash me. he is a bit like that. here is some more pics. and i will get some decent footage when i get a chance.
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ahh roger. do you have to enter beforehand? or do you just rock up? pretty keen though.
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AJD?
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sure, but it will cost 10 grand and may take a few years. but seriously, probably not it is a lot of effort, and i don't think anyone would be willing to pay what it would cost.
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I'm glad wou all like it, i just took it for her maiden voyage! it went really well, considering it still needs a lot of tuning, already HEAPS faster than the 4k. it is an a ke70 and i live in brissy. phil m-f
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check out rides section for more info on my engine prob should stop hijacking this thread
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OK, I have always had an obsession with the trd 3kr engine from back in the day, realised I was never going to get a real one so I decided to build my own. I don’t recommend this conversion to anyone I did it just to be see if it could be done. It took a lot of time and if I was not a fitter/turner a lot of money. Hope you find it as cool as I do. - Phil Matthews-Frederick. To save a lot of questions here are the specs. Head 4AGE small port head, head stud holes elongated to suit 4k block Head face machined 2mm Front face milled to clear 4k waterpump 11.5:1 static compression Valve train Stock valves trd springs cam tech 294 8mm lift belt drive system using 4ag pulleys adjustable cam pulleys 38mm camshaft extensions Oil fed support block with needle roller bearings for camshaft extensions Crank pulley mounted on the front of the standard v-belt pulley Block Sonic tested Bores repositioned and overbored by 6mm Decked by 3.8mm Lifter bores, head oil drains and feeds blocked Mechanical fuel pump removed Crank Side counterweights removed Knife edged Balanced Shot peened 2kg lighter than stock Flywheel lightened by 4kg Pistons Late 4age smallport cast pistons Balanced Conrods 4age smallport rods Balanced Shot peened Oil system 4k internal oil pump shimmed to 60psi oil pressure Hose feeds to head, cam extension bearings and oil pressure sensor All original head oil drains blocked External head oil drains 4k camshaft remains to drive oil pump Sump Increased capacity by 1L Built in air/oil separator for crankcase breather Fitting welded on for oil drains Cooling system 3 core alloy radiator Remote thermostat Heater ports blocked Ignition system 4k electronic distributor modified to suit 4age head Ca18 sparkplug leads Inlet Quad Mikuni 40mm CV carbs 70mm trumpets Exhaust Hi rise tuned length headers 2” straight under-diff exhaust, huabusa muffler in-car muffler by-pass valve Externals 3k-r look cam cover Electric fuel pump landcruiser V8 starter motor here is a short clip of the old girl at lakeside. http://www.youtube.com/watch?v=0V18NT9mJpQ&feature=youtu.be
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- 3k-r
- 4k twincam
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tried to get a recording on my phone so you could see how quickly it revs. not very good quality but you can sort of hear it if you crank up the volume http://www.youtube.com/watch?v=C4PWewL0404
