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Just a few thoughts about this idea There is no surplus "used oil" to be extracted from the rod bearings. If you make it easier for the oil to escape from the bearings it will have a negative impact on oil pressure in the bearings. Which you probably will not be able to see on the gauge s...

Planning doing 4 oil grooves/side in H-rod big end thrust face to extract used oil and lubricate cylinder walls and piston pin. Any thoughts about that kinda idea? OIt should not effect oil pressure compared to using narrow rod big ends with piston steered rods? Subject is B20 with 85mm stroke grind...

The skrev: ↑ons nov 08, 2023 10:34 pm Det är en 240mm?

228mm har jag för iallafall, och 215mm kanske.

Yes its for 240mm disc.

Do someone know 883082999707 pressureplate bolt/location pin circle/pattern?

I'll stick my neck out and say that you could use either one of them. And the difference will not be that big. The squish distance might be a more important decision, but the size and design of the squish surfaces together with CR ratio will influence what distance will work best. There are several...

What is max cr with R-cam and 98 fuel?

My options are ~11.4 with 0.8 gasket and 0.8mm squish,
~11.2 1mm gasket and 1mm squish and ~10.85 with 1.2mm gasket and 1.2mm squish.

Stock Volvo B20 works fine. Erland Thats too easy and simple. :lol: I allready have Isky double springs with dampers for Datsun A12 engine and i gonna try those, 46.5kg seat pressure and 88.5kg full lift. Made centering washer 4.5mm thick under the spring so now i can get 36mm assemblyheight and my...

Jens Gustavsson skrev: ↑tis sep 26, 2023 7:27 pm max race rpm?

7000rpm limiter.

Those Scat springs i used to shim 47.5/85kg and worked niçe. Except cracking and pretty poor quality.

What valvesprings are best/good quality to use with R-cam? I have been using Scat single springs 2 years now but when took the head of for more modifications found one spring cracked. Snapped in half when twisting it by hand. Thank god it didnt snapped totally in the dyno week before. I have measure...

Erland Cox skrev: ↑tor apr 06, 2023 9:38 pm You can just round the corners, that should be enough.
I do not think that you need groves in the rods as long as you have some side play. 0,25mm should be enough.

Erland

Okay and thanks again

If you grind a crank to 85mm you must relieve the 4 sharp cut outs in the number 1 and 4 rod throw. Make sure that the bottom corner is rounded instead of sharp. Take the same amount of metal from number 2 and 3 beföre balancing. Erland Now i understand this,misumderstood before :hihi: Should i jus...

Sounds OK. So the next step should be to build it and test it in order to find out if it behaves the way you want it to. Yes. Waiting to get my new billet flywheel and clutch so i can take crank and flywheel/clutch to be balanced. And need to bore block 92mm and test aseembly it so i can determine ...

Personally I think the exhaust ports looks pretty good. At least so good that I think that if you try to make them better the risk that you make them worse is bigger than the chance that you make them better. Then there's the question of the balance between inlet and outlet flow, plus what air spee...

I would widen out the combustion chamber around the inlet valves - make the chamber more look like a wide funnel. At the bottom of the chamber it doesn't have to be wider than it is because at low valve lift there's not much air streaming in. But to gradually widen the chamber as valve lift increas...

I'm not an expert when it comes to porting, but I will offer a few thoughts. - The inlet valves seems too big. They sit very close the chamber walls and I think that might have a negative effect on both flow and swirl. - The exhaust valves seems too small. Exhaust valves do not lose flow when sitti...