Author Topic: welding on a block  (Read 4264 times)

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Offline blue demon

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welding on a block
« on: April 19, 2012, 10:14:27 pm »
I have a 16 hp vanny horiz...I want to remove the stock pvc breather assembly and weld a plate in it's place with a pipe fitting ( for venting the crank case)
   I also wanted do put vents tubes in the valve covers ,not sure  about that one yet.  I also heard someone say somthing about venting the block to the exhuast pipes as a way to help venting at higher rpm's....

   Anyway my concern is that I would be welding realy close to the lifter bores.
sacvalleymowerracers

Offline Ron Atchison/A.C.E. Race Engines

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Re: welding on a block
« Reply #1 on: April 20, 2012, 10:07:32 am »
simply modify the stock case vent plate by removing the pulse plate. i have not found any other vent modifications necessary. There is ample venting with the stock layout unless some build that cause a lot of ring blow-by.
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Offline Huffy044

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Re: welding on a block
« Reply #2 on: April 20, 2012, 11:39:23 am »
I run a pulse fuel pump to my crankcases to put a vacuum on them, seems to work pretty good. I tried the exhause venturi deal, no luck, talked to the guys at ARC about the work they did on the exhaust set up, they did not care for it.

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Offline oldfordman21

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Re: welding on a block
« Reply #3 on: April 20, 2012, 05:08:37 pm »
 Tap the existing hole in the block and install an AN fittng and then you can run stainless hose any place you want, no welding necessary. If the proper fittings are not installed correctly in the header pipes and I believe the use of Chrysler vents, then the header system won't work. Done correctly, it is well worth the effort.
Garry Kerr

Offline Ron Atchison/A.C.E. Race Engines

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Re: welding on a block
« Reply #4 on: April 22, 2012, 12:06:55 pm »
you need to have the evac tube in atleast 15 degrees upstream outside tilt with around 1/2" of the tube inside. i have successfully used the evac system with and without the check valves. Chrysler smog pump check valves is what we have used for many years.
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Offline blue demon

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Re: welding on a block
« Reply #5 on: April 23, 2012, 01:09:37 pm »
I know there's a few ways to vent it , I was just worried about welding on the block if I went that way...
  I just recently got a spool gun and haven't welded on a block before ......
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Offline GRUBDIGGER

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Re: welding on a block
« Reply #6 on: April 24, 2012, 03:19:11 pm »
I know there's a few ways to vent it , I was just worried about welding on the block if I went that way...
  I just recently got a spool gun and haven't welded on a block before ......

WELD ON SOME SCRAP FIRST. EVERYTHING YOU KNOW ABOUT WELDING, THROW IT OUT THE WINDOW. WHEN IT COME TO ALUMINUM EVERYTHING CHANGES.
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Offline gaines crew

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Re: welding on a block
« Reply #7 on: April 24, 2012, 04:02:02 pm »
you should preheat the block to 300 to 400 degrees F first. If I had to build up areas I always used a spool gun, then went back over the area with a tig to blend and float the dirty alum to the top.
Erick Hollar

Offline saltyAMF

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Re: welding on a block
« Reply #8 on: April 24, 2012, 04:21:47 pm »
for welding on something like that id warm it up a little and just tig it.   no big deal
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