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Old 12-05-2010, 09:27 PM   #1 (permalink)
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mighty diesel cylender head bolts? anything good bout em

found a forum about them are they any good? thinkin about getting them Mighty Diesel - Diesel Performance Parts For Cummins Powerstroke Duramax and More

a link to the bolts just wondering if they are worth it as they claim to be better than stock bolts but not as good as studs
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Old 12-06-2010, 12:01 AM   #2 (permalink)
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I'm not sure about the bolts but the guy mr Tony from mighty diesel is an excellent person and I buy pretty regularly from him. He has never steered me in the wrong direction and is pretty decent on giving good deals. I would give a thumbs up for him!
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Old 12-06-2010, 12:04 AM   #3 (permalink)
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If you are going through the trouble then go studs. I'm not sure where a little better than stock bolts, but not as good as studs lands you on the performance scale. I'd rather not find out the hard way either. JMHO tho.
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Old 12-06-2010, 12:06 AM   #4 (permalink)
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^^^^ agreed!
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Old 12-06-2010, 06:40 PM   #5 (permalink)
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I worked it out a few months ago that based on size and strength, the bolts are 35-40 % stronger than stock, and the standard studs are 55-60% stronger that the stock bolts. The 90 + 90 method of torqueing yields about 135lbs, or the same as studs. The bolts should work up to about 550hp or 50lbs of boost.

I've had them for about 6 months and run up to 50lbs with no issues yet. I'm thinking that I'll prolly test em with twins next year.

Having a flat head and block is the best way to keep from blowing the head gasket.
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Old 12-06-2010, 10:24 PM   #6 (permalink)
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I worked it out a few months ago that based on size and strength, the bolts are 35-40 % stronger than stock, and the standard studs are 55-60% stronger that the stock bolts. The 90 + 90 method of torqueing yields about 135lbs, or the same as studs. The bolts should work up to about 550hp or 50lbs of boost.

I've had them for about 6 months and run up to 50lbs with no issues yet. I'm thinking that I'll prolly test em with twins next year.

Having a flat head and block is the best way to keep from blowing the head gasket.
being you have worked it up already what is the tensile strength of the stock bolts?? This will save me from testing one??
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Old 12-07-2010, 07:47 AM   #7 (permalink)
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being you have worked it up already what is the tensile strength of the stock bolts?? This will save me from testing one??
The stocks bolts are just under 11mm and about 150,000ksi tensile strength. The 12mm 12.9 allen bolts are a full 12mm and and are about 170,000-180,000ksi. Studs (not a specific brand) are a full 12mm and start at about 190,000 and go up from there.

The stock bolts are meant to be torqued to the plastic stage, and the stretch in the bolts is supposed to even out the force around the head. The studs and hi-strength bolts work on the principal that stronger is better.

Also, be aware that there are mutiple manufacturers of various high strength bolts that will work. I don't actually have Tony's bolts, I have a similar bolt that I bought over length and adjusted the size so that there are no threads above the block (just like studs). Also be aware that torqueing the bolts to 135lbs is well above the manufacturers recommendations, but it just seems to work well.
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Old 12-07-2010, 08:09 AM   #8 (permalink)
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awesome info I feel like Im in mechanical design class all over again. Since Im cheap as hell and dont plan to get too wild with my truck I really might go this route I've been eyeing diesel pap's head bolts for awhile.
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Old 12-07-2010, 08:53 AM   #9 (permalink)
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So will you be replacing the head gskt when you replace the bolts, or will you be replacing one at a time?
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Old 12-07-2010, 09:46 AM   #10 (permalink)
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Originally Posted by Drothgeb View Post
The stocks bolts are just under 11mm and about 150,000ksi tensile strength. The 12mm 12.9 allen bolts are a full 12mm and and are about 170,000-180,000ksi. Studs (not a specific brand) are a full 12mm and start at about 190,000 and go up from there.

The stock bolts are meant to be torqued to the plastic stage, and the stretch in the bolts is supposed to even out the force around the head. The studs and hi-strength bolts work on the principal that stronger is better.

Also, be aware that there are mutiple manufacturers of various high strength bolts that will work. I don't actually have Tony's bolts, I have a similar bolt that I bought over length and adjusted the size so that there are no threads above the block (just like studs). Also be aware that torqueing the bolts to 135lbs is well above the manufacturers recommendations, but it just seems to work well.
How did you determine the tensile strength of the oem bolts? I don't believe in studs on the street with the elevated tensile strength comes brittle, I have seen and heard of studs braking.All out racing yes with all the attention a race motor gets and how often its worked on.But with a drive and smile motor no.I have also had high tensile bolts brake not in a Cummings but a VW rabbit diesel built motor so we went to larger stronger bolts in stead of the OEM stretch bolts.These motors were prone to Hg failures with only 4 bolts per cylinder.Any way the bolts couldn't take the cycles and kept breaking, alum.heads grow a lot.After changing the torque on the bolts with no luck we were able to find a larger stretch bolt that took care of the problem .
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Old 12-07-2010, 09:56 AM   #11 (permalink)
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this might be common info, but I was talking with a cummins engine tech and he said cummins claims theirs are good to 50 psi boost, and maybe even a little more if they're torqued to 125lbs, I think. A lot of guys probably upgrade that really could spend the $500 elsewhere
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Old 12-07-2010, 10:23 AM   #12 (permalink)
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this might be common info, but I was talking with a cummins engine tech and he said cummins claims theirs are good to 50 psi boost, and maybe even a little more if they're torqued to 125lbs, I think. A lot of guys probably upgrade that really could spend the $500 elsewhere
Yes very true ORINGS
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