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wen mac testors crankshafts
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wen mac testors crankshafts
Are any of the front carb crankshafts better than others? Some years back I seen a counterweighted crank but didnt remember what model it came from. Recently I noticed a few of the cranks have a center divot machined in the front. I wonder if the ones with the center drilled are the same ones that are counterweighted ? I have had to stop using 5.5 inch props because of breaking cranks. I assume its due to over speed. I would appreciate any info you may have.
Phil
Phil
chevyiron420- Gold Member
- Posts : 251
Join date : 2015-01-28
Age : 66
Location : Barney Georgia
Re: wen mac testors crankshafts
Well, I answered one of my own questions. I found one of my engines with the center dimple in the end of the crank. I removed the cylinder and looked in with a light. Sure enough its a counterweighted crank. Now the question is, do they hold up better?
Phil
Phil
chevyiron420- Gold Member
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Join date : 2015-01-28
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Location : Barney Georgia
Re: wen mac testors crankshafts
Call it "karma" ? I was just disassembling an older Testor/McCoy 049 I bought off eBay the PO had broke the con rod trying to get the cylinder off. Unseen in the posted photos, the crankshaft pin had broke off also. I had a replacement cylinder and piston. I was not sure I had a crankshaft. The broken crankshaft was a "counterbalanced " style. The crankshaft I found in my "unknown" parts bin is not ground down "not counterbalanced "
Looks to me, because the crank pin was located on the "thin" portion of the crankshaft, the counterbalance design was the weak spot.
The question I now have is the pin on the crankshaft is in a different position (4 o'clock) vs the broken pin was at 2 o'clock! Could this be a Right handed crankshaft?
Looks to me, because the crank pin was located on the "thin" portion of the crankshaft, the counterbalance design was the weak spot.
The question I now have is the pin on the crankshaft is in a different position (4 o'clock) vs the broken pin was at 2 o'clock! Could this be a Right handed crankshaft?
Marleysky- Top Poster
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Posts : 3618
Join date : 2014-09-28
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Re: wen mac testors crankshafts
Marleysky wrote:
The question I now have is the pin on the crankshaft is in a different position (4 o'clock) vs the broken pin was at 2 o'clock! Could this be a Right handed crankshaft?
The only reason I can see for the difference is that your engine must be the wen-mac type engine with the vertical front venturi and the other (4 o'clock version) could be from the non-reed valve Testors plastic case type which used side induction.
The port can be seen at the front of the mounting rail.
Oldenginerod- Top Poster
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Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria
Re: wen mac testors crankshafts
I almost bought a parts engine on ebay with a busted rod like you described. I needed cranks so I sent a message to the seller about the crank pin and sure enough it was broke. I would have been mad for sure if I had bought it and the fault had not been revealed on the auction.Marleysky wrote:Call it "karma" ? I was just disassembling an older Testor/McCoy 049 I bought off eBay the PO had broke the con rod trying to get the cylinder off. Unseen in the posted photos, the crankshaft pin had broke off also. I had a replacement cylinder and piston. I was not sure I had a crankshaft. The broken crankshaft was a "counterbalanced " style. The crankshaft I found in my "unknown" parts bin is not ground down "not counterbalanced "
Looks to me, because the crank pin was located on the "thin" portion of the crankshaft, the counterbalance design was the weak spot.
The question I now have is the pin on the crankshaft is in a different position (4 o'clock) vs the broken pin was at 2 o'clock! Could this be a Right handed crankshaft?
I just got two very nice testors mccoy red head 049's with the stunt tanks, and also two parts engines are on the way. I am tickled.
I think your replacement crank is from the engine posted previously.
Phil
chevyiron420- Gold Member
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Marleysky- Top Poster
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Re: wen mac testors crankshafts
Delete this post
Last edited by Marleysky on Tue Jan 24, 2017 9:05 pm; edited 1 time in total (Reason for editing : Blip double posted blank message)
Marleysky- Top Poster
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Re: wen mac testors crankshafts
Rod- thanks for the input, you are right, I think the crank came from, or was the only salvageable part from an old pipe bomb. That would explain why the hole would be 90 degrees off....noon to three oClock.
Phill,.....so do you use "sniper software" to outbid me? Only kidding
I did a double check and verified that the counterbalanced crank DID have the dimple on the front of the shaft.
Oops possible double posted?
Phill,.....so do you use "sniper software" to outbid me? Only kidding
I did a double check and verified that the counterbalanced crank DID have the dimple on the front of the shaft.
Oops possible double posted?
Marleysky- Top Poster
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Posts : 3618
Join date : 2014-09-28
Age : 71
Location : Grand Rapids, MI
Re: wen mac testors crankshafts
Marleysky wrote:Rod- thanks for the input, you are right, I think the crank came from, or was the only salvageable part from an old pipe bomb. That would explain why the hole would be 90 degrees off....noon to three oClock.
Phill,.....so do you use "sniper software" to outbid me? Only kidding
I did a double check and verified that the counterbalanced crank DID have the dimple on the front of the shaft.
Oops possible double posted?
I bought a parts lot ages back that was advertised as OK Cub, but I found not one OK Cub part in it. Included probably 20 brand new piston/rod assemblies and a half a dozen crankshafts. Tuned out to be mostly WenMac as far as I can tell. I know I've used a couple of pistons in other engines and I think I swapped out one crankshaft, but can't remember. I haven't checked that closely to see what differences there may be in the cranks. When you speak of a "dimple", do you mean in the centre of the threaded nose of the crank?
Oldenginerod- Top Poster
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Re: wen mac testors crankshafts
Rod, yes. Front of threaded portion, where prop nut goes on.
Marleysky- Top Poster
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