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Who thinks it will or won't run?


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#1 New.Canadian.DB.Owner ONLINE  

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Posted March 05, 2017 - 07:43 PM

Awhile back I mentioned I needed a replacement engine for my 5hp tiller. It needed to be dual shaft.  I had to choose between a Briggs 4 hp dual shaft with a badly scored cylinder (100292 ...) and a Briggs 5hp gear reduction engine (130252 ... ) with a stuck valve & a slightly scored cylinder.

 

I went with the 5hp, but stole the crank, cam shaft, etc from the 4hp engine.  I had to keep the old connecting rod because the wrist pin was smaller on the 4hp engine.  The problem is that the 4hp had a shorter crankshaft throw &/or the 5Hp connecting rod is shorter. Either way, the piston stops 1/4" from the top.  

 

Hence, the question: will it run?  

 

I have honed the cylinder, but it is about .003" over with a stock piston and reused the rings that are just in or just out of spec.  I lapped the valves while I had it a part. I haven't done a compression test yet, just to keep the guessing interesting.  I do have spark.


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#2 pryan05 ONLINE  

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Posted March 05, 2017 - 07:59 PM

Yes!  Post a video of the first time you start it! 


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#3 Gtractor ONLINE  

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Posted March 05, 2017 - 08:21 PM

It'll run fine but it'll have less than 4 horsepower because of the lower compression


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#4 dthomp17 ONLINE  

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Posted March 05, 2017 - 08:23 PM

I don't think it will have enough power to operate the tiller if it runs.


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#5 chieffan ONLINE  

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Posted March 05, 2017 - 08:25 PM

Should run but will be short of pulling or lugging power.  Might have to spin it over faster to get it going.


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#6 stiemmy OFFLINE  

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Posted March 05, 2017 - 08:46 PM

It should run, but we'll see. Some old flatheads ran @, 6:1, or right around there for compression. The real question is, how much power is it gonna make?

You could mess with deck height, or mill the head, and or thin head gasket to raise the compression, but, you have to keep an eye on valve clearance to the head, and personally I dont believe these mods are going to make a big difference imo.

Edited by stiemmy, March 05, 2017 - 09:07 PM.

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#7 EricFromPa ONLINE  

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Posted March 05, 2017 - 08:52 PM

It will run.

 

Power? it's gona be lacking a bit. But it might have enough to use the tiller if you go slow.

 

 

True story here.The K181 in my Cub Cadet 70 was smoking a good bit so I pulled it apart.What I found wrong with it is just Nuts.It had been bored .010 over and crank turned .010 under.That's all good.But someone stuck a K161 rod and piston in it.Rod is 1/4" shorter.But it ran OK just a little down on power.It would struggle with the 38" deck set down to 1".

 

It had a couple other problems that are much much worse though.Glad I bought that spare block for it.I'm gona need it.


Edited by EricFromPa, March 05, 2017 - 08:53 PM.

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#8 secondtry OFFLINE  

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Posted March 05, 2017 - 09:41 PM

I would say that unless you are used to running that machine in good condition you won't even notice. Don


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#9 karel OFFLINE  

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Posted March 05, 2017 - 11:39 PM

shoulda went with new rings


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#10 holdenboy1960 OFFLINE  

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Posted March 06, 2017 - 04:05 AM

it will run but be down in compression and power torque , only be light application engine , and don't hard ( over ) revv it 

 

Shane 


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#11 karel OFFLINE  

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Posted March 06, 2017 - 09:19 AM

it will run but be down in compression and power torque , only be light application engine , and don't hard ( over ) revv it 

 

Shane 

That's why I said, shudda went with new rings. Woulda been a whole different animal if he shaved the head to.


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#12 29 Chev OFFLINE  

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Posted March 06, 2017 - 07:15 PM

If you honed the cylinder wall and then did not use new rings the engine will probably smoke and use oil as the rings will probably never seat again.


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#13 dodge trucker ONLINE  

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Posted March 07, 2017 - 07:21 PM

if it runs with the piston down in the hole that far it will be a complete turd. not enough power to run that machine in the dirt, for sure.


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#14 nitro OFFLINE  

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Posted March 08, 2017 - 05:32 AM

if it runs with the piston down in the hole that far it will be a complete turd. not enough power to run that machine in the dirt, for sure.

Brings me to mind of the '79 Malibu 267 I had once.  No compression, no balls.


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