- Location
- Minneapolis, MN
I heard an interesting argument the other day. I now understand the importance of truing the crank, but some swear welding is not needed...
what do you all think?
what do you all think?
trued/welded cranks debate
- Thread starter Coreyf983
- Start date
crammit442
makin' legs
- Location
- here
I always have mine T/W. My builder believes in it, particularly in high HP motors. They're not heavily welded though. I know another really smart motor guy that doesn't believe in it and he does ok w/o doing it. I don't buy the theory that welding destroys the hardness of the pins. Careful welding puts almost no heat into it. FWIW, Crankworks as well as most crank builders do it on all stroker cranks unless you specifically ask them not to so maybe they have a reason.
I only know a little bit about a little bit here, however I think everyone will agree that truing a crank is a good and important thing. With that said if your already going to true a crank you might as well weld it. Even if its just for peice of mind, its not alot of extra work if your already truing it. Also there is no bad sides to welding it. Im sure someone with alot more knowledge will chime in here.
Think about this, how many crank builders are going to throw away an expensive crank because it didn't fit as tight as they would like? Is there an inspector standing there watching the gage on the press? Welding is sold as a reliability enhancer when in reality its to cover up poor workmanship.
WFO Speedracer
A lifetime ban is like a lifetime warranty !
- Location
- Alabama
In the case of mass rebuilders it is a fix for sloppy fit on the pins,it is also used by top rebuilders to ensure crankshaft stays in true during shipping,mishandling by customers or whatever.
DCRocks
Wavejunkies
- Location
- Washington DC
I would imagine, that the difference between the "good" cranks suppliers, and the "bottom end" crank suppliers, is at the "good" ones, the answer to that questions is "yes". Part of the reason the customer pays the higher price, for the higher quality crank to begin with.
Boris
The Good Old Days
- Location
- The surf-less coast
On a 3 cylinder heavy couch that rides in chop WOT welding is a must IMO.
The twin crank in a light stand up has much less twist put on it from the pump.
The twin crank in a light stand up has much less twist put on it from the pump.
tom21
havin fun
- Location
- clearwater FL
soooo is it better to have a welded loose fit crank or take a chance that one that isn't welded is tight fitting? seems like cheap insurance.
DCRocks
Wavejunkies
- Location
- Washington DC
I agree. i just got a hotrods crank, and got it trued and welded. I figured now was the time to do so, as a cheep precaution for the long run.
tom21
havin fun
- Location
- clearwater FL
not much to debate really- quality isn't expensive- its priceless.
yamahammer
are you men the police?
- Location
- San Angelo, TX
anyone got a pic of a "spun" or loosed crank?? ive never seen one. curious.
Mouthfulloflake
ISJWTA member #2
- Location
- NW Arkansas
it wouldn't take much movement to put one connecting rod out of time with the other
Kaveman
Born in USA(not Kenya)
- Location
- texas but soon tejas
Difficult to see with the eye. Is most accurately found with a degree wheel and and dial indicator when in engine; v-blocks or truing stand and a dial indicator when not installed.
Just a few degrees can melt the piston.
yamahammer
are you men the police?
- Location
- San Angelo, TX
^^ over my head man:Eyecrazy:- ill just swap parts until something fixes it
uch:- i do work at a car dealership service dept you know- thats how it works...right??? :thinking:
eel
Our home is girt by sea
I have built more than my fair share of cranks in my shady past. Trueing is a given. I have seen brand new oem cranks as far out as .014".
We used to have exchange cranks in stock for emergencies but prefered to build the customers individual crank. That way, if you have a crook nose or sloppy pin hole, you can call the customer and see what they want to do.
Individual crank parts are sometimes hard to come by, seeing that the manufacturers prefer to sell a complete assy. Sometimes you have to weld but personally, I prefer not to unless it's a sxr open class engine or 3 cylinder racer.
We used to have exchange cranks in stock for emergencies but prefered to build the customers individual crank. That way, if you have a crook nose or sloppy pin hole, you can call the customer and see what they want to do.
Individual crank parts are sometimes hard to come by, seeing that the manufacturers prefer to sell a complete assy. Sometimes you have to weld but personally, I prefer not to unless it's a sxr open class engine or 3 cylinder racer.
WILDBILLHD
I'M GONNA BE A GRANDADDY!
- Location
- Catawba,N.C.
Trued and Welded crank debate
Well,I see nothing wrong with Trueing and Welding(spot welding)a crank.Back in the 70's I had a 440 Speedway Blue Max snowmobile(yes,a snowmobile)with a slightly modified 440 Kohler Free Air engine,60 HP stock.I trued and SPOT WELDED the crank.A straight crank just performs better,less friction,less heat.By spot welding the pins 180 degrees apart theres NO excess heat buildup,and the hardness is not affected.I also did the same thing to my sons big bore 701 Super Jet,just to make sure the bottom end is as bulletproof and reliable as can be,as well as checking the Main Brg. Housing Bore for proper size(yeah,i know the brgs.are pinned).Its just part of building and blueprinting the best engine you can.Well,thats just my opinion,and we all know about opinions......................:biggrin:
Well,I see nothing wrong with Trueing and Welding(spot welding)a crank.Back in the 70's I had a 440 Speedway Blue Max snowmobile(yes,a snowmobile)with a slightly modified 440 Kohler Free Air engine,60 HP stock.I trued and SPOT WELDED the crank.A straight crank just performs better,less friction,less heat.By spot welding the pins 180 degrees apart theres NO excess heat buildup,and the hardness is not affected.I also did the same thing to my sons big bore 701 Super Jet,just to make sure the bottom end is as bulletproof and reliable as can be,as well as checking the Main Brg. Housing Bore for proper size(yeah,i know the brgs.are pinned).Its just part of building and blueprinting the best engine you can.Well,thats just my opinion,and we all know about opinions......................:biggrin: