2270 Build, Need advise Options

[pilothyer]

I am interested in building a 2270 engine. From what I can see I will need a stroker crank with a 78 mm throw. I am concerned about which rod to choose. I have seen stroker cranks with VW type 1 journals as well as 2.0 liter and chevy. I have noticed variations in rod lengths as well. I am in need of some advise on a good, proven combination. I know there are many good engine builders on his forum that could share their knowledge on this subject so please do...............Thanks

[Jake Raby]

Sure, if you never use WOT you won't produce more heat. So who builds a performance engine and never uses wide open throttle?

He's talking about a street car here. Sure he can use WOT without issue, because by the time the engine sees enough load to become heat soaked, the driver will either kill himself or will go to jail. Sustained periods of heavy load are the enemy, luckily when producing more power, the instances that warrant these sustained loads are reduced, on the street.

When using this power on the street the cooling system has plenty of time to recover so heat soak does not occur. I see this in testing all the time, and its how I can build a 284 HP 2.9 liter T4 and have it run 75 degree cooler CHT on pump gas. This is how a lot of guys with all sorts of turbo charged engines can get away with running high boost levels.

An internal combustion engine is only about 30 percent efficient and the other 70 is heat. No one changes that. If/when that higher HP performance engine gets onto a track or is driven for any amount of time at WOT or under load you need to disperse more heat. Making it more efficient only means the percentage you have to disperse is a bit less, but double the HP and it's still a LOT more heat, regardless. That's physics, no getting around it.

Odd, I never knew that you were a Physicist.

[DBCooper]

Odd, I never knew that you were a Physicist.

No need to be, Jake, just pay attention in high school.

Nothing you've said changes the fact that more HP equals more heat. What you've said is that it doesn't matter for most people because they'll never generate enough extra heat to cause problems, or that part throttle doesn't create as much heat. Of course, but that wasn't the question. When you double the power (or potential power) you double the heat (or potential heat). That's a law of nature that you aren't changing.

So your advice is to use part throttle to keep the heat down? Good to know.