Guru stud kit sealing?
02-26-09, 08:47 AM
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Guru stud kit sealing?
i have heard of people having problems with the guru oversized stud kit leaking water out the back of the block. i will be building my engine in a couple days and want to ensure the that i dont have a coolant leak. any tips?
02-26-09, 06:03 PM
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A proper bolt *as Mazda designed it* has an elevated shoulder that is 100% smooth (no thread cut on it like on a stud/nut) and thus the sealing washer with integral rubber seats tight against a perfect surface (seat in housing chamfer and flat surface on tension bolt) thus you have no leakage path and a reliable seal.
O-ring and the like DO NOT seal on leakage paths that interlink one element to another (such as is the case with a spiral thread interlinking the water jacket to the atmosphere) the only way you can hope to stop it is by drowning it in silicone sealant and that is not only ghetto but will ALWAYS leak.
Proper design is a BOLT! not a threaded stud and nut as it will NEVER seal correctly or the odds of it being right are similar to winning the lottery
02-26-09, 06:34 PM
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Good thread, I was going to buy a set of Guru oversized studs. My buddy bought the standard sized studs he now has 300 miles on the engine no problems yet.
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02-26-09, 06:45 PM
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I got the 12.7 mm kit in my engine ,no leaks. Make sure you do a coolant pressure test up to 30psi, let it sit for a while and see if it leaks .
I did not use any silicone with my o rings and have no problems at all. Lube the o rings up good and see how she does under pressure. The question is whom did you r machining for your stud kit. If Rohan did it? I don't think you will have a problem.
I did not use any silicone with my o rings and have no problems at all. Lube the o rings up good and see how she does under pressure. The question is whom did you r machining for your stud kit. If Rohan did it? I don't think you will have a problem.
02-26-09, 07:35 PM
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It is a spiral cut thread onto which a rubber O-Ring is asked to provide a positive seal *that will never ever happen* you need to use copious amounts of ghetto silicone sealant and pray you do not get a leak.
A proper bolt *as Mazda designed it* has an elevated shoulder that is 100% smooth (no thread cut on it like on a stud/nut) and thus the sealing washer with integral rubber seats tight against a perfect surface (seat in housing chamfer and flat surface on tension bolt) thus you have no leakage path and a reliable seal.
O-ring and the like DO NOT seal on leakage paths that interlink one element to another (such as is the case with a spiral thread interlinking the water jacket to the atmosphere) the only way you can hope to stop it is by drowning it in silicone sealant and that is not only ghetto but will ALWAYS leak.
Proper design is a BOLT! not a threaded stud and nut as it will NEVER seal correctly or the odds of it being right are similar to winning the lottery
A proper bolt *as Mazda designed it* has an elevated shoulder that is 100% smooth (no thread cut on it like on a stud/nut) and thus the sealing washer with integral rubber seats tight against a perfect surface (seat in housing chamfer and flat surface on tension bolt) thus you have no leakage path and a reliable seal.
O-ring and the like DO NOT seal on leakage paths that interlink one element to another (such as is the case with a spiral thread interlinking the water jacket to the atmosphere) the only way you can hope to stop it is by drowning it in silicone sealant and that is not only ghetto but will ALWAYS leak.
Proper design is a BOLT! not a threaded stud and nut as it will NEVER seal correctly or the odds of it being right are similar to winning the lottery
200 miles on mine and hasn't leaked so far.
02-27-09, 12:49 AM
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i did not start this thread to hear whether or not you like the stud kit, so stop with that ****. i just want to know how to ensure the back of my engine is not going to **** water. a-spec is doing the machine work.
02-27-09, 05:17 AM
#15
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guys guys guys
For those of you who have never used the kit, be quiet and don't say anything please.
Ive used both kits' the 10mm kit and the 12.7mm kit and have not had any issue.
When u open up for the 12.7mm studs u can't use the stock sealing washers between the block and the nut that comes with the kit.
Now what u hafto do is use a washer that is quite tight against the studs and also use a o-ring that fits down into the machined grove that the person that is drilling the 12.7mm holes need to make.
If u look on the stock hole there is a machined grove where the rubber gasket on the stock washer will go into to seal between the stock stud and the block. This works fine with the 10mm stud kit as well.
So when i make the hole bigger u will need to make a similar groove to get a new o ring to fit with a washer. And also the person opening up the holes do also need to do a good jobb. If the holes is too big u will ofc get sealing issues.
It works fine, you just need to do it correct. It is a aftermarket mod that involves precice machining work to be done. And should not be done by everyone, and you do need to know what you are doing.
Jan-Tore
For those of you who have never used the kit, be quiet and don't say anything please.
Ive used both kits' the 10mm kit and the 12.7mm kit and have not had any issue.
When u open up for the 12.7mm studs u can't use the stock sealing washers between the block and the nut that comes with the kit.
Now what u hafto do is use a washer that is quite tight against the studs and also use a o-ring that fits down into the machined grove that the person that is drilling the 12.7mm holes need to make.
If u look on the stock hole there is a machined grove where the rubber gasket on the stock washer will go into to seal between the stock stud and the block. This works fine with the 10mm stud kit as well.
So when i make the hole bigger u will need to make a similar groove to get a new o ring to fit with a washer. And also the person opening up the holes do also need to do a good jobb. If the holes is too big u will ofc get sealing issues.
It works fine, you just need to do it correct. It is a aftermarket mod that involves precice machining work to be done. And should not be done by everyone, and you do need to know what you are doing.
Jan-Tore
I've done dowels and studs both on 900hp 13B's I like my studs
02-27-09, 05:24 PM
#17
I didnt say your stud kits leak. the possibly dont.
So i hope you didnt misunderstand me.
I have USED a few times guru stud kits and been extremely disappointed and the water leaking out was the last of my worries.
How about some awesome cracked plates.
But anyways this thread isnt about how **** they are. Its about to stop them leaking.
So i hope you didnt misunderstand me.
I have USED a few times guru stud kits and been extremely disappointed and the water leaking out was the last of my worries.
How about some awesome cracked plates.
But anyways this thread isnt about how **** they are. Its about to stop them leaking.
