P51 head repair

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P51 head repair Empty P51 head repair

Post  jc10000rpm on September 5th 2012, 1:02 am

droped a intake valve at the end of last season and had charlie evans fix the head

P51 head repair P51_be11


P51 head repair P51_af11

The pictures speak for themselves, and he charged me too little Wink maybe he will chime in and explain what all was involved.

Thanks for the good work, and to those who helped.


Last edited by jc10000rpm on September 5th 2012, 1:10 am; edited 1 time in total (Reason for editing : learn how to post pictures)

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Post  dfree383 on September 5th 2012, 1:27 am

Nice Job.
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Post  bruno on September 5th 2012, 10:12 am

looks good , just curious is all that pitting going to cause issues down the road ?

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Post  c.evans on September 5th 2012, 10:42 am

Thanks Jeff, I appreciate the kind words. In regards to what we had to do, as you can see, the intake guide was kocked out of it and the intake guide boss was also broken and the hole elongated. So we welded the intake guide boss up, and redrilled a new guide hole with the correct cant and incline angles. Also the entire chamber got welded twice and also the outlying areas of the deck surface got welded. Then new oversize guides and seats from C.H.E. out in California were pressed in after everything was machined correctly. C.H.E. is the original seat and guide supplier for the P-51 heads and the Boss Nine heads. The chamber was reshaped by hand and of course the head was milled.

Nick,

The little porosity holes are due to a couple of reasons, one being the quality of the original molten casting material, and one being contamination of the weld. In other words, many times the same welder can have a better looking weld on a different brand of head, and no it's not going to cause a problem. Those porosity holes are what a lot of 'youse' guys entire chambers look like,,,,,,when you miss on your nitrous tune-up Exclamation Laughing

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Post  kim on September 5th 2012, 1:06 pm

a little pepper on the plug is just right... a lot of pepper on the plug, not so good. Hot is fast, molten is expensive.

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Post  512Fairlane on September 5th 2012, 1:16 pm

Ouch. Charlies group does some nice work.
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Post  jc10000rpm on September 5th 2012, 11:05 pm

my experience has been that carbon quickly fills in any <quote> imperfections, and the shape of that combustion chamber is dead on for the rest (iv seen it in person not just the pictures), i promise there are no issues with this repair job, i only hope i have enough time to get it back together soon.

thanks again

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