LT ROOKIE Posted May 11, 2013 Report Share Posted May 11, 2013 I just purchased an 18mm cheetah Dm and it has a spaced plate and 3 base gaskets. Why is this? Could it be a 14 mm cylinder on a 18mm crank? Will it hurt performance? Motor was originally built by a&s racing. Also I know Dan uses flat top pistons, this one does not. Any info would be appreciated, thanks. Quote Link to comment Share on other sites More sharing options...
LT ROOKIE Posted May 11, 2013 Author Report Share Posted May 11, 2013 I think the spaced plate with all three baskets measured 4.62mm if I measured correctly. Is 060 squish too loose on that size motor for 1/8 mile asphalt Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted May 11, 2013 Report Share Posted May 11, 2013 I mean, this could be a totally ridiculous thing to ask, but have you talked with A&S? I would imagine Dan would know the reason behind it. Quote Link to comment Share on other sites More sharing options...
LT ROOKIE Posted May 11, 2013 Author Report Share Posted May 11, 2013 I tried calling but no answer Quote Link to comment Share on other sites More sharing options...
registered user Posted May 11, 2013 Report Share Posted May 11, 2013 most likely it was a backyard butcher would installed the spacer. not that it wont work but normally it isnt the prefered method. cylinders were probly intended for a different crank and a spacer was the only way to get port timings in the ballpark Quote Link to comment Share on other sites More sharing options...
registered user Posted May 11, 2013 Report Share Posted May 11, 2013 not sure how many different length of rods there are but if someone used longer rods that could be a reason for the spacer Quote Link to comment Share on other sites More sharing options...
RadarRacing Posted May 12, 2013 Report Share Posted May 12, 2013 Every DM is a custom build. Its not a bolt on and ride motor. It could be someone upgraded a cheetah to a DM cylinder or who knows used a 14 mil on an 18 mil cases and crank. They may have got the lower end for a different motor with a rod length different than what worked with that cylinder. I think too many people worry about spacer plates. You didnt say whether it is stock cases or billet. Spacer plates are sometimes used on stock case big DMs because it provides a good flat base for the cyls due to all the case work. I know of two just like that on stock cases. .060 is not too loose for squish on a DM. I dont know what exactly you have a cheetah or a DM , you said "cheetah DM". I would neither worry about the spacer nor the .060 squish which is fine. I would definately do a leak down test before you ride it and then do one again after a ride because air leaks are at times common on welded/epoxied cases. Quote Link to comment Share on other sites More sharing options...
LT ROOKIE Posted May 12, 2013 Author Report Share Posted May 12, 2013 It's on Billet cases. I will continue to call Dan and figure it out. Quote Link to comment Share on other sites More sharing options...
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