Decreasing Stroke??
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
I think these newer longer lasting and non MMC non berylium F1 pistons are probably heavier as well but I can't say that for a fact but then so are cup piston too now with the new rules.
The thing the original poster was talking about was a similar engine and destroking that where the pistons will NOT become lighter and the rods will become heavier and longer so the loads only go up and up on everything.
Destroking any given engine generally results in less power and less durability but more hp per inch since the same heads are now feeding less inches.
If you're in a racing class that lets you drop weight with the smaller size destroked engine it will be faster. At the same weight it of course will be slower
The thing the original poster was talking about was a similar engine and destroking that where the pistons will NOT become lighter and the rods will become heavier and longer so the loads only go up and up on everything.
Destroking any given engine generally results in less power and less durability but more hp per inch since the same heads are now feeding less inches.
If you're in a racing class that lets you drop weight with the smaller size destroked engine it will be faster. At the same weight it of course will be slower
Staging Lane
Joined: Jul 2006
Posts: 53
Likes: 0
Destroking any given engine generally results in less power and less durability
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
You can end up with a piston that is too short for the ringstack you need or run out of bore length and this happens quite often on many of these LS1 deals for sure. If you have sufficient bore length though it seems the sky's the limit but it just gets very expensive with balancing and heavy metal and custom pistons etc. All of the super strokers we have done though always go faster than their smaller brothers but it's definitely a diminishing return at some point.
Will wear out twice as fast and have to fight twice as hard to get rid of friction robbing power. And spend 4 times the amount in valvetrain. Always build the biggest engine you can within your rules unless you dont want more power or there is a particulary happy weight break to be at. Just "destroking" any engine is not smart.
Listen to Erik. Enough piston to handle what your doing, as much crank as you can fit in the case and rod length whatever needed to connect the two! lol
Listen to Erik. Enough piston to handle what your doing, as much crank as you can fit in the case and rod length whatever needed to connect the two! lol
Connecting rods are going to be your biggest challenge. Cost is what separates us from pro racers when making mass RPMs.
The forces exerted on a connecting rod are a function of RPM. The only problem is the forces on the rod are cubed as you increase RPM. At 9000RPM it's going to be in excess of 8000 pounds. That's like a Hummer sitting on your rod bearing.
It's so much easier to make the same power by other methods. That being said I really like the idea of revving to 12,000 and i know how cool that would be!!
The forces exerted on a connecting rod are a function of RPM. The only problem is the forces on the rod are cubed as you increase RPM. At 9000RPM it's going to be in excess of 8000 pounds. That's like a Hummer sitting on your rod bearing.
It's so much easier to make the same power by other methods. That being said I really like the idea of revving to 12,000 and i know how cool that would be!!
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