Author Topic: Welding Clylinder Ears ? (Read 3557 times)

Frogzilla · « **on:** March 07, 2013, 07:13:27 pm »

I got a queston about welding the clylinder ears . When do you need to do it ? When you raise the compression , if so what ratio/psi . Or does it need to be done when you start replacing the pipe and carb ? Or should you weld them the first time you need to bore the clylinder ? Does the big reed have more problems than small reed ?

Mitch Keller · « **Reply #1 on:** March 07, 2013, 07:29:58 pm »

Over the years I been told many different reasons.
01 The 87 don't have the frame support like the 88 and jumping the 87 can cause cracks.
02 Due to the more aggressive porting that is out now that can weaken around the ears
03 I would only do this if a bore is required are having a aggressive porting done, you will loose a bore when welding ears due to warpage, your cylinder will also need to be decked from the bottom to be squared with top and you will be required to use a thicker base gasket when assembling to keep port timing correct.
If I missed any thing I sure SQ-HQ members will add more.

El Diablo · « **Reply #2 on:** March 07, 2013, 08:24:39 pm »

Is it necessary? No. My old Tudor's engine was not reinforced. However it did crack & was repaired again. My currant engine that was originally done by Duncan was not reinforced either.

I have it done now & I would recommend it to everyone. It does add rigidity to the cylinder. Even if you don't need it, it's like an insurance policy. It's good to have.

Johnny Rage · « **Reply #3 on:** March 07, 2013, 09:12:19 pm »

Iv had 2 stock cylinders with cracks i bought the zilla with them... seems pretty common I guess....my current cylinder is welded no issues

Q2W · « **Reply #4 on:** March 08, 2013, 09:12:40 am »

All 500 jugs will crack eventually. If you do any work, best to weld ears for insurance.

Buckeye513 · « **Reply #5 on:** March 08, 2013, 11:32:09 am »

Anyone have a picture of what welded cylinder ears should look like?

Nopick · « **Reply #6 on:** March 08, 2013, 01:18:40 pm »

Frogzilla · « **Reply #7 on:** March 08, 2013, 06:22:04 pm »

I think that answered my question. I will have it done, that will leave me three bores sizes to go. Besides the Zilla money pit is starting to settle a little bit, time to throw in more cash.

Buckeye513 · « **Reply #8 on:** March 08, 2013, 09:23:32 pm »

I don't mean to be dumb but I'm not sure what I'm looking for in that picture.

QuadMan8 · « **Reply #9 on:** March 08, 2013, 11:18:54 pm »

ball park what does this cost to have done---dont you typically have to bore the cylinder once over after welding it up.

El Diablo · « **Reply #10 on:** March 09, 2013, 09:20:53 am »

Quote from: Buckeye513 on March 08, 2013, 09:23:32 pm

I don't mean to be dumb but I'm not sure what I'm looking for in that picture.

See the part of the cylinder where it gets bolted to the case, right next to the intake area? It is beefed up around the ears. The stock ears sometimes crack or even break off.

Quote from: QuadMan8 on March 08, 2013, 11:18:54 pm

ball park what does this cost to have done---don't you typically have to bore the cylinder once over after welding it up.

Price will depend on who does it. And yes, the cylinder will need to be re-bored as well as decked.

Nopick · « **Reply #11 on:** March 09, 2013, 04:18:25 pm »

It was $100 for that one but I was having a bunch of other work done at the time. Just call around and get some prices. 500 Fanatic did mine.

GrkGuy · « **Reply #12 on:** March 09, 2013, 07:03:11 pm »

just about ever builder can do them, just make sure you get someone that does them .
not someone that just says that they can. lots of stuff needs to be checked after it gets done.

Duneatic70 · « **Reply #13 on:** March 10, 2013, 11:52:56 am »

Go to Jerry Halls forum on this website & he will beable to help you!! He did mine & im really impressed with his work!!!

Motoman991 · « **Reply #14 on:** April 15, 2013, 05:33:59 am »

Quote from: Buckeye513 on March 08, 2013, 09:23:32 pm

I don't mean to be dumb but I'm not sure what I'm looking for in that picture.

It's the two main bolts by the intake that hold the cylinder to the tranny.

Gillio · « **Reply #15 on:** April 15, 2013, 05:41:22 am »

I think Jerry will tell you that all gasket surfaces will need to be decked after the weld up.

Motoman991 · « **Reply #16 on:** April 15, 2013, 05:49:31 am »

The gasket surfaces should be decked. The extreme heat of welding will distort the metal.

Buckeye513 · « **Reply #17 on:** April 15, 2013, 06:35:22 am »

Does this still need done if you don't run top motor mounts?

Motoman991 · « **Reply #18 on:** April 15, 2013, 07:09:00 am »

Quote from: Buckeye513 on April 15, 2013, 06:35:22 am

Does this still need done if you don't run top motor mounts?

It's a good safety precaution.

Nopick · « **Reply #19 on:** April 15, 2013, 07:19:43 am »

If you are putting money into your engine for performance and reliability, get it done. It is not expensive and could save you from having a catastrophic failure where a crack develops and propagates up through the intake tract. Essentially causing the part of the cylinder the reeds sit in to break off.

There was a picture of that failure on this site or the old site.

AustenW · « **Reply #20 on:** January 19, 2014, 12:09:14 am »

Can someone add some more pictures of what's been done?

I'm based in the UK and just in the process if getting this done

Stripped the jug yesterday, acid dipped it and bead blasted it

I was going to reinforce it above the top reed bolts, what else should I do?

Hawaiiysr · « **Reply #21 on:** January 19, 2014, 12:25:50 am »

Anyone have a pic of failed ears?

LT250RWV · « **Reply #22 on:** January 19, 2014, 02:39:31 am »

Here is a couple pics. Jug had one hour after rebuild. Get them ears welded.

Buckeye513 · « **Reply #23 on:** January 19, 2014, 06:43:24 am »

Here's a cylinder in the process of having the ears welded. Might not look the same for every builder. These are of a guy on facebooks cylinder he did himself.

Zilla273 · « **Reply #24 on:** January 19, 2014, 01:04:13 pm »

Ive been told that detonation can cause the cracks around the ears

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Author Topic: Welding Clylinder Ears ? (Read 3557 times)

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