I currently have an F22C. However if I reduce the displacement to 2.0 liters then I can move to the lower Autocross class DMod rather than Emod where I currently sit.

While it pains me to destroke the motor it will allow me to lose over 300lbs (20%) from the car which should more then make up the ~10% power loss.

My current motor makes great power so I am thinking about just switching out the crank, connecting rods and pistons (probably higher compression pistons).

I know the K24 crank can be used to increase stroke and wondered if one of the K20 crankshafts can be used? Finding a good used F20C crankshaft and connecting rods has proved difficult. I really want to keep it under $2000, for that price I can buy an entire F20C engine take the best of both and have a spare.

Anyone have any suggestions for the easiest way to destroke the motor? I will do all the work myself. The motor is for Scrap Metal my 1750lb Autocross car I built from Scratch. Has anyone done the stroker kit and have the spare parts they are willing to sell?

 

Not worth the cost and time to crack open the motor and potentially ruin it. Id shop for a cheap higher mileage F20 and just do a 100% drop in swap. I think you can find a good motor for less then $2500.

 

I agree with junky, swap out the motor for cost saving and down time.
You can always swap back later in life

 

Agreed as above, remove and sell your F22c, then purchase a F20c.

 

Bandwagon. Seems much easier, and not much more expensive, to just swap motors.

Actually way less expensive whenat the end you have another motor leftover that is worth about as much as the one you are gonna buy.

Its way easier, way less money in the end, way less risk, way less planning. Actually, I can't think of any downsides...

 

I am currently looking for an F20C engine but also looking at other options. My F22C engine made crazy high power (249WHP and 194Tq) and I am reluctant to give that up with a different engine. Several people have told me that there is no way my engine makes that much power but even if you remove 10% its still really high.

I could not figure out how to add a photo on here but there is a photo of the dyno sheet here on my build log. http://www.locostusa.com/forums/view...4558&start=525

I think a lot of the power gain is from the really short exhaust and much lighter flywheel. However if I get an F20C and it only make 200WHP and 150Tq which is healthy for that engine then I am definitely tearing them down to make the best of both.

 

I wouldn't worry about losing power from the standpoint of switching motors beyond the trq from dropping down to the F20. Guaranteed if you put your current motor in an S2k and ran it on a standard dynojet, you would be seeing typical 225whp/155trq numbers. Your high numbers are from less drivetrain losses likely and a very happy dyno. Ive seen a lot of NA dyno numbers posted for this engine over the decade ive been here, and your well beyond even the occasional controversial freak output that's come up a few times. So with that, don't think that changing out your bottom end and preserving the top end of your car is somehow going to preserve the strong output integrity of your engine, all you will inevitably do is what we stated, which is go through a lot more hassle and short change yourself out of good healthy second motor.

 

Thanks for all the feedback guys I guess I am back to trawling craigslist for a good deal. I picked up my current F22C with transmission, header and harness for $2000 and the engine only has around 40,000 miles on it. Hopefully I can find a similar deal.

 

Didnt think those deals could be found anymore, thats a steel! I found a F22 with 34k on it for $2600 2 years ago and drove 3 hours to pick it up and was extremely greatful since everything else I found at the time was a grand more average. Most F22 seem to hover between $3200-4k and have double or more miles. F20's on the other hand seem to go for a fair bit less, and being a track car, mileage amount isnt as much a consideration as long as its got good compression and leakdown numbers so more miles = cheaper. I would never invest/drop a motor with 100k+ in my s2k because I drive it too much, but a car that might see 200-500 track miles a year, who cares.

 

...and a flywheel can't make more actual peak hp. It can make engine more responsive, and arguably help with power under the curve, but not peak.

If your power is coming from exhaust or other external mods, you'd still have those, so still have that power gain.