I just went through the comp calculator . I was putting the cylinder bore in for the piston . The compression numbers change .. using the pistons with the full dome 9 cc Bore of 3.885 , -2ºon the cam tw37 and a 0.040 head gasket, static comp is 10.26:1, correct comp is9.43:1. Another question . What is the deterrent from retarding the cam?
What is the deterrent with going with a 0.040 head gasket?
First, there is no -2* key or sprocket, none that I am aware of anyway. Woods sells a 4* sprocket to retard or advance intake close. There is no real deterrent to retarding or advancing cam timing except in the case of cams with lifts of .600" or more where heads may have been decked and thinner head gaskets used. In these cases, advancing or retarding cam timing positions the open exhaust or intake valve closer to the piston at TDC which can be problematic. However, it should not be an issue with lower lift cams like the 37. Hemrick used to make an adjustable pinion sprocket that would allow cam timing to be advanced or retarded up to 10* but they don't offer that gear any longer. I have been looking for one for two years.:s
'03 lower units did not have the Timken case bearing but still had the hot forged crank; I misspoke in my last post. The hot forged crank was replace by a cold forged crank in early '05 and '07 and up cranks are cast, IIRC. So, again, considering that your build is typical of many that run on stock cranks with no issues, I maintain that if your crank runout is less than .003", run it and save the $$ to remove the lower unit, split the cases and true, balance and weld the crank. Having said that, should you decide to spend the $1500 or there abouts, less shipping, to send the lower unit to Darkhorse; they are the best. However, Silvermoon and Rev Performance will T/B/W cranks for about $300 but you would have to remove the lower unit and send them the crank. This is something you could/should discuss with your indy. I run a 95" motor with BigBoyz heads, 44G cams with CCP at 190+ in a 2005 Deuce; motor makes 104TQ/94HP and I have 25K miles on this motor, stock crank with no issues. Runout was .0025 when I installed the gear drive cams. I am planning to bore and go to 98", better heads and more cam this winter but will not do any crank work. If I were in your position, I would save the money on crank work and upgrading the cam chest and spend that money on headwork and fuel management. JMHO.:s
Couldn't edit quick enough.
You are about to spend a fair amount of money on this project and obviously are investing time thinking and asking questions to develop a plan that will deliver the results you want. I just want you to get those results; no buyer's remorse.
Yes its fun lol . Its a great tool. Iv been looking for the cyco tensioner pads but can't find on line to buy. Anyone could u steer me in the right direction.
Here is the link to the tensioner information. You will have to call CYCO and order; I don't believe they take orders online. Not sure if the sell retail; if you have a problem ordering, let me know as I have an account and can buy and have the tensioners and the install tool drop shipped to your address. I would however request that payment in advance.:s
