Performance difference without Stuck Side and Corner Seals
12-05-07, 06:57 PM
#1
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Performance difference without Stuck Side and Corner Seals
Tore down 2 12a's and all the side seals on all 4 rotors were stuck. The corner seals on one set were also frozen because they had the stock skinny corner seal springs behind them... the other 2 rotors had the big fc corner seal springs and those werent stuck.
I was driving around with the street ported motor that had both the stuck side and corner seals... and when I mean stuck I mean stuck. I soaked them in parts cleaner for 24 hours and sprayed pb blaster over them for another 24 and all side seals broke during removal no matter how carefull I was.
This is my 1st rebuild and I wanted to know what type of performance increase I could expect after the rebuild because of the condition the original seals?
Also... it's hard for me to believe that sea foam or mmo or atf or anything short of a tear down and dental pick would have freed those seals. They were fused by carbon into the slots. It also seems too coincidental that both motors had seals that were stuck to that degree. Is this something that inherently happens after x number of miles or have people seen high milage 12a's that had free seals?
I was driving around with the street ported motor that had both the stuck side and corner seals... and when I mean stuck I mean stuck. I soaked them in parts cleaner for 24 hours and sprayed pb blaster over them for another 24 and all side seals broke during removal no matter how carefull I was.
This is my 1st rebuild and I wanted to know what type of performance increase I could expect after the rebuild because of the condition the original seals?
Also... it's hard for me to believe that sea foam or mmo or atf or anything short of a tear down and dental pick would have freed those seals. They were fused by carbon into the slots. It also seems too coincidental that both motors had seals that were stuck to that degree. Is this something that inherently happens after x number of miles or have people seen high milage 12a's that had free seals?
Long day at work.
12-06-07, 05:04 AM
#5
Starting early with Sefoam and maybe switching to pre-mix will solve most of the sticking seal problem. Good and regular tuneups make a difference too. If the engine is subjected to frequent cold starts, short drives and low rpms, the carbon builds up quicker.
As to how much more performance, the difference will be in the higher compresion of a fresh rebuild. If you don't have pre-teardowm compression numbers, you have no gauge to work from.
As to how much more performance, the difference will be in the higher compresion of a fresh rebuild. If you don't have pre-teardowm compression numbers, you have no gauge to work from.
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