Felix

3k cams have a wide rear journal. I'm not sure about all 4k's, but I do know that the later dished piston 4k's and 5k's have narrow rear cam journals. As madrolla said, check for end float to be sure.

If you want to use a standard replacement clutch, I've found the daikan clutch plates are better than PBR. They grip harder and wear less.

Get a ke30 speedo and cable. That is what I have in my ke15.

Just run ke30 or ke55 discs with ke20 hubs on your original struts. Needs 13" rims. It tells you how to do the ke30 disc conversion in the FAQ. Works great with the standard master cylinder. On my ke15, I run ke30 discs on an unboosted stock master cylinder with a modded 5k. Awesome solid pedal feel with heaps of feedback. Pulls up from 100 kays in about 30 meters with A539 tyres. Only time I've experienced brake fade is on a long steep mountain descent.

Or solenoid contacts. Some solenoids can be dismantled and the contacts cleaned up with some fine wet and dry for a bit of extra life.

:lolcry:

LOL, sometimes. :P

I got 90%.

Don't think it is a 7k dizzy. The gear is in the wrong place, and it also doesn't have the drive tang to turn the oil pump.

The ONLY motors to have smaller valves were the original K and K-B (1077cc) motors. Not sure about 2k's as we never saw them in australia. ALL 3k's, 4k's and 5k's share the same valve size. A ke30 3k head is exactly the same casting as a normal 4k head. The only difference is a 3k head is skimmed a bit more. rwd-starlet could simply skim his existing head to achieve the same effect. That is unless he has a dished piston 4k-e EFI motor in his starlet which would make all the earlier heads incompatible unless he want's to decompress his motor.

Sorry to say, but I think you need a new motor... Either that or time for a rebuild. With all that oil in number 4, it looks like the rings are gone in that cylinder. It is pretty common for number 4 to go first, especially if the motor has been run without a thermostat for some time.

Not properly, escort/cortina rims are 4x108. You would be risking the possibility of broken wheel studs. Mazda, and ke1/2x are 4x110.

The 5k sumps I've had are identical to late dished 4k sumps, they are larger than the early 4k ones. No problems with fitment into a ke1x with the ones I've had, and my motor sits lower than stock with a modded mount on on side. Not sure if they are the same as van ones... You have to remember that a lot of 5k's came into the country as jap import motors, so unless the motor came out of a van, you can't really be sure of the motors original application. The main reason the upright motors go harder is because the inlet manifold has a straighter, less restrictive path into the head. As for rpm levels, a 3k is capable of a lot more revs than what say a 5k is. Do some research on rod ratios and piston acceleration. Also you have to keep in mind that at 9k+ rpm a 5k will need a proportional increase in valve area (over a 3k) to meet airflow requirements. Think offset valve guides, thinner valve stems, and multi-angled oversized valves, plus porting and flow bench time.

Why bother reinventing the wheel? For the amount of money you will likely spend on your 5k, you would be well on your way to finishing a 4age conversion. You could always buy kangaroosa's worked 5k, or madrolla68's fresh 7k with change. By all means if it floats your boat go for it. Just be prepared to sink extra $$ into it for extra work to sort out the bugs. 10,000 rpm from a 5k.... Good luck! I'd say you'll need 45mm webers on jungle juice, an uprighted motor, many many hours on a flow bench with a lot of work invested in the head, plus a lot more. Then you would need a close ratio gear set the keep it on cam between gearchanges (lotsa $), plus a race track to drive it on so you don't get pissed off with traffic.

How long since it has been serviced and tuned? Maybe try running premium in it. I've always found it gives better power and fuel consumption in older cars.

I had some rwd 323 rims on my ke15 at one stage, the ones I had were 4.5" wide.

Rad Rolla, if it is for a ke1x or ke2x, look for RWD mazda 626 rims. They are 13x5.5" and are way easier to come by than the rx4 rims.

More likely the head is warped from overheating. Get it skimmed at a machine shop, should only cost around $50.

My ke16 had a davies craig thermo fan on it when I go it. It had the the ignition feed wired from the coil to the relay. It was running an electronic dizzy (with bosch transistor coil) and never had any starting issues whatsoever. The power draw to feed the thermo relay was negligable, as I measured the spark voltage at 30,000 volts at idle with and without the fan running. Compare that to my ke15 with an echlin gx80 sports coil, jaycar HEI and scorcher points dizzy at 25,000 volts. KE1x cars run non-ballast coils.

Stu, 4k and 5k dished piston heads have a couple of protrusions under no 1 and 4 spark plug holes. If you are going to boost it, just bolt on a normal flat top head from a 3k or 4k. This will decompress it cheaply without resorting to spending a heap on new pistons. That is providing that your existing bottom end is sound. I'm assuming your motor has dished pistons as 90% or more have... You liking your swaybar? :) Doug

Use ke20 disc brake wheel bearing kits. The ke10 drum brake bearings are identical, except the seal on the back of the hub is different. You need to change the hose from the strut bracket to caliper. Everything else is just a straight bolt up.

I think another variation is in the cam timing for different models of K motors (using the same basic cam). Take half a dozen cam sprockets from different K motors and put them against each other and line them up by the cam locating dowel, and you will see quite a big difference in how the teeth line up. :) Using the one cam grind and varying the cam timing can make quite a change to the power curve.

Ring part number for 4k dished pistons from ACL is C1843. Otherwise everything is pretty much the same as for a normal 4k, with the exception of the front and rear seals which are thinner and the same as a 5k. Make sure you convert it to a double row timing chain.

You could always run 3k pushrods which are 3.5mm shorter than normal 4k ones. :)