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-   -   Billet freeze plugs/bypass (http://www.competitiondiesel.com/forums/showthread.php?t=205381)

Gorms 01-13-2021 11:04 AM

Billet freeze plugs/bypass
 
Popped the rear plug today on way to work, fun. Happened during a spirited run through 3rd gear. Not sure if maybe I didn't set it properly on install, has been completely leak free for 5k miles since I freshened up the motor. Head and block were properly cleaned before I assembled everything, all coolant plugs were lock tighted in, none have leaked until today. (It completely popped out).

I'll be replacing it with a bolted version for sure, just wondering if it is worth it to do the bypass kit? Truck is just a fun daily now, might hook a camper behind it a few times this summer. Not sure what it makes for power, does brake traction in any gear though if not careful. 3k rpm for now, 5x12s, 215pump, and he351/ht60 making about 60psi on close to stock timing.

Truck was not very hot when it happened, just got off highway in 20 ish degree weather, cooled down some between stop lights probably.

Timbeaux 01-13-2021 03:29 PM

How often have you been having spirited runs?

Gorms 01-13-2021 03:49 PM

More than I should, just about every day I drive it.

I figure its the best way to find the weak links while close to home. I go easy when more than 200 mi from home.

bateman 01-13-2021 05:13 PM

Everyday haha nice. Same here. Gotta let em eat.

thatguy69 01-13-2021 06:11 PM

How high do you run your rpms?

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Gorms 01-13-2021 06:47 PM

Currently have 3k springs in it, I regularly hit 3k. It seems to defuel starting at 3200, I haven't seen much higher than that

bateman 01-13-2021 07:07 PM

I’ve read some threads about the pressure relief vs temp relief. I’ll try to find it. I’m pretty sure I read it here.

zstroken 01-13-2021 07:41 PM

Make sure the truck is thoroughly warmed up and several thermostat cycles. IMHO what happens, block/water gets up to temp. Thermo cycles, lets cool water in, hits the freeze plug, plug "shrinks" just a little, and pop! Out it goes. You can also drill a few holes in the thermostat. Also I used a water pump off of an industrial application, it had a larger pulley so it ran slower at a given RPM, trimmed the fins, never had an issue and my truck saw 5000 RPM several times.

thatguy69 01-13-2021 08:20 PM

I've also done the trimmed water pump with good results, and still towed heavy in the summer without getting hot.

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K204DR 01-13-2021 11:06 PM

Quote:

Originally Posted by Timbeaux (Post 2739192)
How often have you been having spirited runs?

hate it when I get the spirited runs,,,,,,,,,

Gorms 01-14-2021 12:33 PM

I dont plan on hitting 5k, but was going to throw in the 4k springs and bump timing to 20 or so degrees,, now that its good and broken in.

Ordered a Keating plug with the threaded plug in it. Where would that get routed to to help with excessive heat/pressure?

Vincejax 01-14-2021 05:18 PM

I run a bolted rear plug with no bypass on my race truck with 0.300" trimmed off diameter of water pump fins. Hit 5000+ rpm many times with no issues.

bateman 01-14-2021 05:23 PM

Quote:

Originally Posted by Vincejax (Post 2739300)
I run a bolted rear plug with no bypass on my race truck with 0.300" trimmed off diameter of water pump fins. Hit 5000+ rpm many times with no issues.

So the rest of the plugs are stock or billet block plugs as well? Iíve heard the ones on the head can be a problem too?

Vincejax 01-15-2021 09:17 AM

Quote:

Originally Posted by bateman (Post 2739301)
So the rest of the plugs are stock or billet block plugs as well? Iíve heard the ones on the head can be a problem too?

Rest of plugs in block are also bolt in. Still have stock press in plugs in the head. I have blown the plugs in the head before trimming water pump, no problems since.

bateman 01-15-2021 11:33 AM

Good to know. Thanks

Muddin_dude06 01-18-2021 06:58 PM

I did a bolt in with a -4 line running from it up to the heater line. Everyone used to complain that a full 5/8” line would make it take forever to warm up because it was bypassing so much. So I figured a smaller line will still bypass some but not enough it take a long time to warm all the way up but still give a place for excessive pressure to go.

kawi600 01-20-2021 03:03 PM

How are you getting at that rear plug? pulling the trans back?
This is something Id like to do, but have never had a plug fail. Maybe just leave it alone.

gman99 01-20-2021 03:40 PM

I used a bolted billet plug and a Watts Valve set around 50psi that bypasses to the upper radiator hose with 5/8" heater line. Supposedly the fringe benefit is that it allows more coolant to flow around the rear cylinder at high rpms keeping it from getting as hot and pinching the rings like we've seen so many times. Spins to 5k no issues and when i tore it down #6 looked perfect.

Gorms 01-21-2021 05:49 PM

I was thinking of running a regular 5/8 line back to the extra nipple I had below the oil cooler, from when it was an auto. Would that be on the right side of the cooling system?

zachu812 01-22-2021 08:54 AM

I wouldn't bother with a bypass personally, get a bolt in plug and forget about it.


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