7000rpm

Please don't upset me... Liking the sound of this, but in a suitable box though. Well I definitely need one for the next engine. Squeezed my 4k for all the bang for buck mods, maintaining street driveability and 98 fuel. Now i need to plan swapping that gear over into an 83mm bored out 5k block

Can you bring some 5k blocks over then

You should be ok with the used pushrods. yes, they are flat tappets. Cam break in proceedure seems good. The reground cam should have a specific lube applied that the cam grinder sends you. i ran mine for about 12 minutes at about 2000rpm, was all good

Nice progress! Glad to hear it goes good. I donot t run softmounts on my twin webers at all. Also use bolts from carb to manifold and not studs as I am limited with space to the strut tower

Yeah go see sheldon at rush automotive. He is the k series king!

I was playing with one recently that was sluggish. I found the cat was blocked and the igniton timing was retarded. I would also check that the tvis valves are shut under 4000ish rpm and opening after wards On a car of this age, I would flush the fuel injectors, change the fuel filter and clean out the throttle body (carby cleaner). This is more updating the maintenance than fixing issues. It's common there will be gunk between the throttle butterfly and the housing, reducing air flow at idle.

I would run 28mm venturies and have done so with the same setup (was a solex carb)

Run on can be the carby shut off solenoid not working, typically

What starts out as a cheap/free 4k, can end up costing a few grand when you get carried away building a track engine

Ive managed to get 3 x 4k engines in the last 18 months in exchange for alcohol! In Sydney, most guys do the 4age conversion. 5ks seem hard to get here. Ive enquired at a couple of forklift shops and nothing avail. I would love a 5k block.

Sounds like you have progressed towards where you need to be..well done May I also suggest you get a wideband. I have a bosh o2 sensor kit and autogage guage. Checked against the dyno air fuel ratio metre and surprisingly it was on the money accurate

30mm chokes are pretty small for a 1600 bud. I think you would need to be in the 34-36mm range. I run 32mm on my 1300cc 4k

If i can make a suggestion, if you are going to spend the money and time setting up twins, you may as well do other engine mods like a reground cam, increased compression and cylinder head porting to make it worthwhile. twins on a stock motor wont yield a great deal of power increase

Hi Mac I plan to take my ke70 out there before the end of the year. Have some more work to do first. Done a few wakefield days since starting the build

An ovehaul kit should sort it all out. i have a spare ke70 one if you need it

You mean Esa? Seems that page has been up for a while. I wonder if he still has all those bits available?

Ive ran a 12.9 in my S14. That weighs 1240 kg sounds like more fun in a sub 800 kg Corolla!

Should go well

The adjustable pulley is to dial in the cam. Most engine rebuilders will recommend doing this on any non factory cam. k series valves have 8mm stems, 100mm length. Intakes 36mm head and exhaust 29mm Datsun are 8mm stems but the length is longer. With a ground cam and adjustable rockers, some guys get away with installing them and having enough adjustment. Others shim up the rocker shaft posts, like joshua matthews did on here. In australia Datsuns are common and cheap, hence a cheap upgrade. In Europe your machine shop might have say vw or bmw valves for example that work out cheaper for you. Valve stem thickness variations can be overcome by using different guides and retainers. Alternatively your machine shop might get some aftermarket valve like a manley or ferra, which is what mine is doing right now! Not sure if they are still active but it seems there is a class of racing in finland that have been using the k series engine. Might be worth investigating seeing as you are close to them for parts.

Not saying yours has. I'm pretty sure my old 5k did out of interest, is most of your high rpm driving on dirt tracks?

The t125 looks more like in line to your goals to me. With single barrel per cylinder carbys, it should be nice enough to drive I run a more aggressive cam and twin webers which smoothed out the idle and low rpm pulsing. On a single carby, sounded like a rotary haha!

Increasing your valve head diametre increases the curtain area which assists with flow and cylinder fill.Typically the compression ratio is also increased by doing this, pending the valve concave. yes, there are many builds around that this is claimed to be a worth while mod. I believe a number of 5ks had solid lifters standard. Whilst hydraulic units still perform, you are at no risk of lifter "pump up" and essentially increased mechanical efficiency through direct contact of the components. Same reasons i believe people use roller rockers. there is actually a guy in portugal that has posted up his 4k build in the facebook page i just kicked off called "toyota k series engine projects and spare parts" depending on the quality of fuel in your country, id be aiming for 10-10.5:1 compression and a road engine and over 11for racing

You could just try ordering the 5k solid lifters from toyota. The part number is 13751-61020 Lots of guys have had good results with datsun a15 1mm oversize valves. You may need to swap over to 4k adjustable rocker gear Id look at the ports short radius and see if you can improve, but apparently the twin squish head ports are heaps better for velocity than all of the ther k series heads. Maybe have your machinist velocity and flow test after larger valves are installed. Yes, you can use your seats. what is the duration at .050 and lift of those cams? what is the fuel octane rating in your country?

Cool which turbo are they looking at running?

Question So if this is your second engine, and it has a cracked piston, how are these engines failing?