Rotor Heads,
What end Irons (without the "O" ring grooves) have the biggest port runners in stock form. Which Center Iron has the biggest runners. I need the year and engine model of each, and Part numbers if you have them. I need to build a monster 12A bridge port for next year. https://www.nopistons.com/forums/pub...1047683561.gif Thank you. Lynn E. Hanover |
'74-'75 front and rear, and '83-'85 intermediate. I'm sure others will have differing opinions.
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Do they HAVE to be without grooves? Couldn't you just fill them with Devcon?
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The early 12A centre (we know it as the R5 Tallport) has 50mm high runners. Most of the endplates I have seen all have the same runner size, but the popular one for J-porting here is the 3B early 13B plate because it takes less work to fill the water jacket with Devcon.
As an aside, why not try and find a cheap 13B-RE out of the J-spec JC Cosmo. The runners are enormous: endplate runners are like a 6-port endplate with the material between the 5th and 6th ports removed; and the centre is tallport size. Of course, they have the o-ring grooves, so you would need matching rotor housings. The best housing for them would be from the 89-91 TII. Use a set of 89-91 N/A rotors with the shaft and counterweights from the 13B-RE as they are the same balance but 9.7:1 compression. Have them milled for 3mm apexes if you are going carbon, or stay with 2mm and go ceramic. That is a recipe for a hell engine if built right. |
I think he has to keep it a 12A for the class.
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Originally Posted by TYSON' date='Feb 22 2004, 01:20 PM
Do they HAVE to be without grooves? Couldn't you just fill them with Devcon?
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Do all the coolant passages still line up? https://www.nopistons.com/forums/pub...1047683561.gif
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Originally Posted by TYSON' date='Feb 22 2004, 04:28 PM
Do all the coolant passages still line up? https://www.nopistons.com/forums/pub...1047683561.gif
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Well I just checked my '84-'85 13b housing against my '86 one, they all line up, there are some minor differences though, although I can't see those effecting the performance of the cooling system at all though.
Hmm interesting.. because I have a mint '85 housing that i'd really quite like to use in my '86 engine if there aren't any really bad problems im not thinking about. |
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