Originally Posted by
husaberg
Each to his own I guess.DO NOT POST IMAGES PLEASE
Have a look in thread tools images in the ESE thread there are images that are not on the thread?
now you have me worried
they could be ones i posted of ss90 but got sent to the usless drivel thread
do they look like a crank sprayed yellow then attacked with a grinder ?
Originally Posted by
SS90
Ok, in the interests of putting a value to the primary compression ratios applicable to modern porting and exhaust designs, I have modified a crankshaft (just using logic as to how much material to remove, making a cardboard template, and marking with a yellow spray bomb ), and, as I assemble the engine I will measure the crankcase volume at TBC and at BDC, so as to calculate the primary compression ratio).
I will then compare the dyno curves to 4 other known "high tuned" engines ( 3 other tuner have agreed to send me some dyno runs for comparison) with the same cylinder (I don't know what primary compression ratios other are running, and also the exhaust being used is a prototype, so it will be an interesting comparison.
I will also measure the exhaust gas temperature.
I have also found the the standard "Transfer stock" ( fully open point at BDC) is about 1mm too high.
I am certain this was not intentional by the designer and is more likely a manufacturing/casting fault.
As such, I have sent the crankcases to have 1mm removed from the cylinder base. I'll pick them up on the way to work tomorrow, it is a little dissapointing, as it involves more work.
I currently still am of the opinion that the standard exhaust port duration is too low, and I really am considering raising it to 188 Deg before assembling it.......
"Instructions are just the manufacturers opinion on how to install it" Tim Taylor of "Tool Time"
“Saying what we think gives us a wider conversational range than saying what we know.” - Cullen Hightower
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