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Farmall & IHC Tractors Discussion Forum
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Firecrater piston questions

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Shovelman

04-13-2006 15:02:51




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We are overhauling one of our H tractors and our machine shop supplied the engine parts. He ordered Clevite liner kits and when they arrived, they had firecrater pistons. I have read that modifications to the spark advance and rejetting the carb is sometimes recommended with firecraters.

This is our raking and tedding tractor and I just want it to run reliably. It has an H-4 mag and the spark advance modifications I have read about appear to be for distributor equipped tractors.

What should I do, if anything?

Any help will be appreciated.

Thanks,
Scott

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gene bender

04-14-2006 03:26:28




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 Re: Firecrater piston questions in reply to Shovelman, 04-13-2006 15:02:51  
You mite have to go to a DIST as there is NO WAY to advance a MAG as it will fire T.D.C. then go to 36deg when it runs. The problem you mite run into i the MAG cannot be changed for advance when in start mode. I had this problem when i went to a RED POWER kit the domes were very high and it would not start with a MAG. Put a dist on the engine and starts great. Friend who was I-H mech said there was a notice from I-H when using FIRE CRATER you need a dist.

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the tractor vet

04-13-2006 18:14:41




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 Re: Firecrater piston questions in reply to Shovelman, 04-13-2006 15:02:51  
The normal mods were updated to a dist . Install the next size jet and change the advance cure in the dist. as there is was a complet kit for this and it has been ten fifteen years since i redid one with the dist curve kit it backs up the total advance to 27-28 degrees from the 40 degrees that the old ones had and this allowes for better bottom end performance and also reduces the temp of the engine while working .

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ChadS

04-14-2006 07:18:51




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 Re: Firecrater piston questions in reply to the tractor vet, 04-13-2006 18:14:41  
Watch the piston to head clearence on this setup,,, I dont know about the H kit with firecraters, but the Super H with firecraters,, with the older H gas heads, the pistons hit the head. I had to grind a section out of the combustion chamber on the manifold side, to a replica of the SH-350 head compression chamber. There is plenty of meat to remove in this area, it dont take much, maybe a swipe about 3/4 inch wide, and at an angle. You can do it with a 4 inch hand grinder. If you have trouble with it, I have pictures of what I have done to make it work. Just hollar back, will email, or post it here. Chad

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Magman

04-13-2006 17:02:21




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 Re: Firecrater piston questions in reply to Shovelman, 04-13-2006 15:02:51  
Nothing, I have been running that combination for 30 years in one of my Hs. You may want to play with the timing a little when you get it broke in to get it to a sweet spot. Just be carfull if you crank her that its not set before top at all or it will kick. JON



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Shovelman

04-13-2006 18:16:12




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 Re: Firecrater piston questions in reply to Magman, 04-13-2006 17:02:21  
Thanks for the advice. I'll give it a try.

Scott



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