![]() ![]() Looser skirt.a little slap never hurt." - Joe of the West "I tend to lean toward a tighter gap and a You're using a bigger than stock cam, and require more compression. If you were using a stock cam I would agree that it might be too much compression, but you're not. I'm sure it will run fine, but for the most power small chambers with tight decks on big cams are the way to go. Your cam is also bigger than stock so you can deal with higher compression. The head seal has been a problem in the past for Type 4 engines. ![]() Plus the step creates a grove between the head and the cylinder for carbon to collect and harden, which should increase the sealing effectiveness of your heads. Lower deck and smaller chambers (of the right shape) can make a lot of compression safely, especially when you use a bigger than stock cam. You also decrease your combustion chamber, so yes, your compression will go up slightly, but not a whole lot. This way you increase deck height, or allow for deck height. It's almost like you are boring the head to be part of the cylinder. This allows your piston to stick up out the top of the cylinder and fit into the head. When you 'step cut' your head you leave the seating area alone and cut away the area where the piston fits. When you 'flycut' the head you remove seating material, decreasing your deck and increasing your compression. I'm confused, can someone explain what that is? The CR is already to high this is why I need the 0.05 shim. ![]() This is how I entered the dimensions in the excel calculation. I have pretty mutch decided that I will not use them on my engine. No!!! I do not try to warm up the head gasket discussion. will be some weber 40 / 44 IDF or if I can get one for O.K. The engine is a 914 2.0 type IV, I decided on a Web Cam 86 grind, 94mm K&S 8.0:1 with 2cmm dish, no head work except a mild flycut (58 ccm)no porting no polishing, carb. Maybe someone on this board knows about a place that sells 0.05 shims. I also would like to know if combining shims (0.04 + 0.01 … might be an alternative that does not result in oil leaks. I guess what I’m looking for is some advice regarding the CR and the deck height. By using a 0.06 shim (this one is also available) I would end up with A CR of 7.77:1 and a deck height of 0.072 which is probably to much. By using a 0.04 shim (this seems to be available) I would end up with A CR of 8.12:1 and a deck height of 0.052.ģ. The problem for this configuration is, that I can’t find a 0.05 shim.Ģ. If I would use a 0.05 shim I would establish a CR of 7.94:1 and a deck height of 0.062 inch. For a 8.0:1 CR I calculated that I would need a 0.047 shim (which of course is not available for a 94mm piston).ġ. The excel calculation that someone on the board put together worked very well. here it is again!!!įinished the crank case tonight and installed one piston and cylinder temporarily to measure deck height … Hi, I posted this befor and now I can't find it. ![]()
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