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Author Topic:   Pro heads and spark plugs????
dirtracer14
Member
posted March 20, 2004 10:12 PM
Has anyone had a problem with dome pistons and the 64 cc pro head and having the plug hit? Do i need to run a plug that is shorter...or notch the piston? thanks


goinrcn44h
Member
posted March 20, 2004 11:04 PM
are they brand new? or have they been fine and all of the sudden this happened? did it do it on only one cylinder or more than one? did you change from one kind and make of plug to another? maybe they just need indexed correctly and that alone would solve the problem.but, indexing and changing plugs is a whole ton easier than notching 8 pistons correctly
44H


dirtracer14
Member
posted March 21, 2004 08:31 AM
This is all new stuff...my first set of pro heads. I was wondering if there was a certan plug that would not stick out so far. the plug they put in was a ac r44t....he said we could probally get away with indexing them ...but thats just to close for me, that is somthing that i would forget and then it would get me.


goinrcn44h
Member
posted March 21, 2004 11:04 AM
There are variations on tip length for a given heat range from just about all plug makers. If you do a combination of indexing and using an extra plug washer or something like that you will likely be fine. You can clay a plug like you would a valve or anything else. maybe take an old plug, knock the center out and bring it up and over TDC and use a dial indicator. or you can just run them in and give it a whirl.... you will know before long if it is that close or not...lol

44H

dirtracer14
Member
posted March 21, 2004 08:09 PM
No one has had this problem....im sure im not the only one??? am i


2nd2none
Member
posted March 21, 2004 09:45 PM
yes this is a common problem with the pro's and dome pistons. If you have solid domes the easiest way is to grind the area of the dome down.


willie
Member
posted March 22, 2004 08:27 AM
Mine hit to. indexed plugs then they worked
great..


HarrisMod#30
Member
posted March 22, 2004 09:04 AM
buy some platinum darts

luke

------------------
www.geocities.com/dirtstockcar5


rocket36
Member
posted March 22, 2004 10:47 PM
this is a common problem. you can clearance the piston by grinding some off but that is not really ideal. i'm pretty sure that ross make a real nice piston specifically designed for these heads and their plug location.


chomme
Member
posted March 29, 2004 06:02 PM
this is exactly the reason I run pro 1's and the iron eagles...flow is comparable and dont run into these probs...


Rollin Thunder
Member
posted March 30, 2004 05:10 PM
Who has the new dart platinums for sale? Whats the retail price on them?


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