Invest in billet
- Thread starter mike.
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Doc Sprocket
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Details, man, details! Modifications, operating conditions, engine type... Do tell! If there's a lesson to be had, learn 'em!
I notice it was the conrod that failed, not the 'wheel... Just sayin'!
I notice it was the conrod that failed, not the 'wheel... Just sayin'!
souperman000
New member
exenos
Project Nut
Can you even get billet conrods?
That exploded....
Not sure about billet but I know you can get forged, which is just as good if not better.
r97
Measure twice cut once
http://www.arcracing.com/servlet/the-Billet-Connecting-Rods/Categories
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I'm with toystory here, details! How were you determining the 8,000rpm engine speed?
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I'm with toystory here, details! How were you determining the 8,000rpm engine speed?
Haha it was on a 1973 Briggs 5HP flat head. Not mine. Tillotson carb, custom header, and modified flywheel is all I know for mods. Speed was just over 50 mph downhill, gearing tells us it was close to 8000 rpm. The sound was scary, even before it blew. I thought the flywheel detonated at first!
No lessons learned. We are gonna do it again.
Just kidding.
But seriously we are going to do it again.
Edit:
It had springs and valves from another engine too. Not sure what engine.
Edit 2:
The spark plug is broke, the threads are intact but the insulator is almost gone. Piston may have hit it?
No lessons learned. We are gonna do it again.
Just kidding.
But seriously we are going to do it again.
Edit:
It had springs and valves from another engine too. Not sure what engine.
Edit 2:
The spark plug is broke, the threads are intact but the insulator is almost gone. Piston may have hit it?
Last edited:
Bluethunder3320
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the piston probably hit it if it was going up when the rod broke.. good thing its a flathead or you could have bent the valves
did anything else get damaged? that rod really broke in a lot of pieces haha. ive only seen rods broken from no oil.
did anything else get damaged? that rod really broke in a lot of pieces haha. ive only seen rods broken from no oil.
B.M.800
TheBeal.
Pics of the block? Pretty please?
Russ2251
AZUSA:Powered by LAWN-BOY
No load...expect a boom.
OzFab
New member
r_chez_08
Should be in the shop...
Wow! I am normally a cheapskate, but here I would have said a billet rod and a better FW were vital!
kendelrk
redneck engineer
when you say modified flywheel do you mean billet?but no load can make an engine blow, if it was bring riden it may not have blown the con rod
The fins were machined off and it was rebalanced. It was being ridden, only down hill. We know thats why it blew
Doc Sprocket
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Machined off? Why would anyone do that? There goes your cooling system!
lol it lightens the flywheel and lets it accelerate faster! I would never do it but it's not as uncommon as you might think. I think one of the fins may have been broken or gone anyway. JR dragsters have fin-less flywheels a lot of times, too.
r_chez_08
Should be in the shop...
Its fine as long as the engine doesn't idle for too long.
Think about it- these enngines are designed to run clogged with grass and mud in an almost stationary position.
On a kart or bike air is rushing past the engine.
Doc Sprocket
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A lot of it depends on conditions. Riding like I do, I would never consider going finless. Lets also not forget that a dragster makes a fast, short run.
B man
Tecumseh FTW!
I once thought about trying it. and making a new more efficent cooling system. but im not sure how id do it.
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