Honda MG & MF 750
Moderator: DLRA
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Re: Honda MG & MF 750
These pistons were originally a special order from JE. I had been talking with Brian Weaver at JE , getting a set of pistons how I wanted was starting to get complicated as JE have lots of sub dealers who have the design rights to their custom piston designs and have to be purchased from the sub dealer, unfortunately those sub dealers are small businesses that only buy in minimum quantities but so you have to wait for them to order once every couple of years and they wont change the ring design, so I got lucky man, old school design is good for me and saved a few bucks but I was prepared to pay bucks for my preferred rings design.
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Re: Honda MG & MF 750
Yeah beware of that too,
A race engine shop where I once worked were the first to do custom JE pistons for new V6 Commodore engines. To keep ahead of the curb we didn't restrict who could use our design. Got rods done at Carrillo at the same time. The rods were about .006" longer in pin height than std. The pistons .006" shorter. Anyone who then ordered the "std" design style pistons would struggle to find comp with a stock length rod. Keep us ahead of the game for a short while. Ditto the rods.
Lots of little tricks in the background that backyard builders may not be aware and get stung.
CP will do whatever design you want, no restrictions.
A race engine shop where I once worked were the first to do custom JE pistons for new V6 Commodore engines. To keep ahead of the curb we didn't restrict who could use our design. Got rods done at Carrillo at the same time. The rods were about .006" longer in pin height than std. The pistons .006" shorter. Anyone who then ordered the "std" design style pistons would struggle to find comp with a stock length rod. Keep us ahead of the game for a short while. Ditto the rods.
Lots of little tricks in the background that backyard builders may not be aware and get stung.
CP will do whatever design you want, no restrictions.
Chris
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- Posts: 260
- Joined: Mon May 21, 2012 12:17 am
- Location: Berri Sth Oz
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- Posts: 260
- Joined: Mon May 21, 2012 12:17 am
- Location: Berri Sth Oz
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- Posts: 260
- Joined: Mon May 21, 2012 12:17 am
- Location: Berri Sth Oz
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- Posts: 260
- Joined: Mon May 21, 2012 12:17 am
- Location: Berri Sth Oz
-
- Posts: 260
- Joined: Mon May 21, 2012 12:17 am
- Location: Berri Sth Oz
-
- Posts: 260
- Joined: Mon May 21, 2012 12:17 am
- Location: Berri Sth Oz
-
- Posts: 260
- Joined: Mon May 21, 2012 12:17 am
- Location: Berri Sth Oz
-
- Posts: 260
- Joined: Mon May 21, 2012 12:17 am
- Location: Berri Sth Oz
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- Posts: 260
- Joined: Mon May 21, 2012 12:17 am
- Location: Berri Sth Oz
Re: Honda MG & MF 750
this a kind of a contour map to see where I need to machine.
Inlet valve is good....just need to flycut the 34mm diam to about 38mm
Exhaust is fine , lots of room as both the inlet and exhaust are fly cut to 34mm where the exhaust is only 28mm
The area from edge of piston to the plug is too close from toching to .2 and .3 bit too close
Will have to drill a clearance hole for plug, like the Dynoman JE
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- Greg Watters
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Re: Honda MG & MF 750
being that close and tight clearances offset to one side have you checked the other 3 , nearly like the head is not quite centred on the bores
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Re: Honda MG & MF 750
Yes Greg,
I thought the same so I did check,
I just got back some info from JE today saying those pistons were ordered by a customer as road racing pistons and he had ground the chamber more hemi shape
not sure why he wanted such large exh releif ?
Out of curiosity I will put in the Dynoman JE piston and check the clearance up around the plug area, if its simliar to the new pistons I will do some milling on one side only rather than lathe the whole dome and lose some comp
I checked under the dome, there is plenty of ally meat there to mill and the ring lands are not close.
cheers johno
I thought the same so I did check,
I just got back some info from JE today saying those pistons were ordered by a customer as road racing pistons and he had ground the chamber more hemi shape
not sure why he wanted such large exh releif ?
Out of curiosity I will put in the Dynoman JE piston and check the clearance up around the plug area, if its simliar to the new pistons I will do some milling on one side only rather than lathe the whole dome and lose some comp
I checked under the dome, there is plenty of ally meat there to mill and the ring lands are not close.
cheers johno