Re: [Chrysler300] 300G exhaust manifold repair

I’ll share my experience with cast iron welding (brazing).

My son used to race Quarter Midgets. The fastest class in QM’s was AA. This class used ONLY old WWII surplus pumps from Continental. The engine blocks are cast iron and are not being reproduced in any form or fashion. These things are being run at RPM’s they were never ever designed for (12-13,000RPM's). As a result, they blow up if not rebuilt frequently (every 4-6 races or so) and well maintained.

When they do blow up. people will go out onto the track and pick up the cast pieces (hot, very hot) and give back to the respective owner. The owner can then have them brazed back together like a jigsaw puzzle, for a future run. Not cheap, but nothing about that class was cheap.

This brazing can be done with success, even on supporting areas around the crank. The trade off is that cosmetically, it may not be desirable.

I have 2 of these engines in the basement, expensive paperweights. Each shows signs of previous catastrophic failure, from some prior owners.

Richard

On Jan 25, 2017, at 9:44 AM, 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

Cost of this is interesting to me..Have a couple of broken ones. Furnace brazing is an excellent way to fix it, it will be as strong as original. Welding no good, it leaves residual local stress in the metal. OK on steel, bad on cast iron.

By the way, heads up!!!! One easy way to break them is hang exhaust system head pipe off manifold flange while installing head pipes. BANG, you have two pieces. Tie up head pipe with substantial tie while bolting on, leave tie there until hangers in place and tight.

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Michael Moore mmoore8425@xxxxxxx [Chrysler300]
Sent: Tuesday, January 24, 2017 6:19 PM
To: Bob Jasinski
Cc: Chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] 300G exhaust manifold repair

When I lived in LA, there was a place in Chatsworth which specialized in repairing cast iron parts (heads, manifolds) by oven brazing them.
In other words, they raise the temperature of the entire part high enough to allow the brazing material to fuse and then broughtthe temp down slowly to avoid warpage, This sounds right to me intuitively.
Mike Moore
3ooH

On Jan 24, 2017, at 2:05 PM, 'Bob Jasinski' rpjasin@xxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

I got a phone call from a gentleman with a 300G that has a cracked right side exhaust manifold. Knowing how hard it is to find a replacement, can anyone suggest a facility that knows how to repair manifolds? I realize it is a very specialized job that is outside of the abilities of most welders, but may be possible. Has anybody found someone that knows how to do the job so it holds up over time? If it is even possible? I'd like to help him out if I can, and if you happen to have a replacement manifold you'd like to part with, let me know.

Thanks!

Bob J

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Posted by: Richard Osborne <reomotorsports1@xxxxxx>

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