common rail crossbread - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 20 (permalink) Old 03-12-2008, 04:38 PM Thread Starter
 
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common rail crossbread

has any one ever put a common rail head on a 12 valve engine? going to probally try it.:evil: :93C_peelo
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post #2 of 20 (permalink) Old 03-13-2008, 09:33 PM
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IMO your money would be better spent just getting your 12v head ported. I have heard of putting 24v heads on 12v's, and putting CR heads on 12v's and when the heads are stock there isn't much gain. Just my .02.
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post #3 of 20 (permalink) Old 03-13-2008, 11:01 PM
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Sounds like a job. The valves would slap the pistons. You could P-Pump a 24V head other wise just buy a common rail. The bottom end is virually the same other than pistons and cam. That's why they're both 5.9's. A 24V head on a 12V short block would smoke like crazy if even run.

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post #4 of 20 (permalink) Old 03-14-2008, 05:40 AM
 
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excuse my ignorance, but why would the valves hit the pistons? Are the cams profiles that different?

Wouldn't a 12v cam work fine with the 24v head, pushrods, and rockers?
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post #5 of 20 (permalink) Old 03-14-2008, 03:55 PM Thread Starter
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im getting the head and 5 pistons for free from a motor with a cracked #3 cylinder wall
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post #6 of 20 (permalink) Old 03-14-2008, 10:51 PM
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Quote:
Originally Posted by Dual K20s
excuse my ignorance, but why would the valves hit the pistons? Are the cams profiles that different?

Wouldn't a 12v cam work fine with the 24v head, pushrods, and rockers?
The cam is fine but I was told the rockers were of a different ratio? After looking through google I'm not too sure of the truth though?? Open mouth/ insert foot . I found a pic here that makes me think different. I know the piston bowls are alot different though. So probably would still run like snot. I tried to find a 12V piston that shows the offset bowl but had no luck. Anyhow here's the 24's and the one is a CR at TDC.
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post #7 of 20 (permalink) Old 03-15-2008, 05:00 AM
 
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Yeah I think the spray pattern work make for a very rough, inefficient, and hot ride.

Heres some 12valve pictures


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post #8 of 20 (permalink) Old 03-15-2008, 01:43 PM
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Quote:
Originally Posted by Dual K20s
excuse my ignorance, but why would the valves hit the pistons? Are the cams profiles that different?

Wouldn't a 12v cam work fine with the 24v head, pushrods, and rockers?
The 24v cam profile is way different compared to a 12v and it wouldn't run right. The tapppets are shorter on a 24v as well. Without changing the cam and tappets to 24v it would never run right. Ask me how I know.... A 24v has different cam, tappets, pushrods and of course different rockers. I'm not so sure the valves will hit the pistons but you wouldn't know until you turned it over if you didn't check first. I agree I would just port the 12v head instead of having to buy CR injectors and valve train components.

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post #9 of 20 (permalink) Old 03-15-2008, 03:58 PM
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Quote:
Originally Posted by smokn3500
im getting the head and 5 pistons for free from a motor with a cracked #3 cylinder wall
Sell it and buy a 12V head to port and o-ring while you're at it.

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post #10 of 20 (permalink) Old 03-15-2008, 09:08 PM
 
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well injectors wouldnt work!
oil passages are different!
rocker ratio I believe are different.
I like your outside the box thinking though!
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