you aren't stuck with just those 2 choices. there are 94mm cranks out there which is a nice middle ground at 2.23L. more torque than a 2.1L and more rev's than a 2.4L.

 

[quote=Midnightevo8;8779002]Recently I threw a rod in my 05' VIII. It did manage to smack a hole in the side of the block and Im assuming that the crank is going to be shot as well. So what I'm asking is for my situation which build should I go with. I currently have a 64mm FP Red and will be running mostly on E85 because in Missouri where Im from it is abundant and RARELY would I be switching to a 91 octane tune. I will be using a 4g64 block because I already have possesion of a block with matching caps but dont have a crank. I'm leaning towards the 2.1 because what I've read it has the best Rod Ratio vs all the other stroker builds and was told that the 2.1 would be the most reliable

Based on these factors which build/what compression pistons should I go with?

I think AMS drag car is a 2.1...if its what they use for their evo, then hell i say go that route

 

[QUOTE=THE8UH8;8797784]dont worry about the rod/stroke ratio so much. how high do you need to rev your motor to get the turbo spooled and to get a wide powerband out of it? thats the big question. basically if its any sort of stock framed turbo, go 2.4L. if you are going to use a "big" turbo then you need the rpm capability of the 2.1L to get a decent powerband.

 

There is so much bs in this thread. I don't think everyone understands what a "motor" is used for. I would say if you drag your car every weekend and don't DD than sure a 2.1 might be your money pit however the hole you can't rev a 2.4 BS is crazy. I can name 3 people that rev a 2.4L to 9k at the track without any problems and have for a few years. Most of us that have the LR2.4 all rev to 8650 daily and more at the track if need be!

yes rod/stroke ratio maters but look at some of the honda motors that rev to 10k. Their r/s ratios are the same as our 2.4s. k24/k20 hybrid is almost the exact same. You don't seen them blowing up left and right. It is all about a good build, good oiling, head flow, and lighter rotational mass. With those four things you can rev to the moon and your motor will hold together.

There is no motor out there that will give you the spool, the rpms, the tq, and the amazing power then the LR2.4.

Mikey

 

however high you can rev a 2.4L, a 2.2L can go 500+rpm higher and a 2.1L another 500+ more past that. nobody said that your motor will blow up within 2,000 miles, but it wont live as long as a shorter stroke motor given the same treatment. thats physics, not opinion.

 

hmm i think your wrong, it the other way around?!

 

Longer stroke has higher piston speed, more side loading and more stress on the rod bearings. All that = shorter life.

 

I can't decide!

 

For those who cant decide. I think that it would be best to set a power goal. Figure out which turbo can reach that goal while spooling as fast as possible to reach that power goal. From there decide which engine will be comfortable getting there. Smaller turbos will run out of breath before a built 2.0/2.1 will have its true benefit, While large turbos have to have its high revs to start making power. With med/small turbos like the 3582r through FP green do not require as many rpm to spool and hit efficency. The 2.4l will have enough rpm to get full benefit of the turbo and still have a great midrange due to increased displacement. The only time I would consider a 2.0 with med/small turbo would be for drag racing.

 

this is exactly what i was looking for also. i have a fp hta3582 on my car and im trying to decide between the rpms of the 2.1 or the torque of a 2.4, now ive read thru this thread and my only other question is about my specific turbo. do u guys think a 2.4 will utilize that size turbo well or am i going to be missing out on power that would come with higher rpms in a 2.1. i dont know enough about the turbos characteristics to know if i would even benefit much for the extra rpms.

 

the 3582 will be perfect. Spool fast and make 700hp. Can't ask for much more

Mikey

 

I pulled the trigger on the 2.4L

 

2.4 all day and twice on weekends

 

2.4 FTW

Mikey

 

So I've decided that I'm going with the 2.4. I got my motor pulled out and suprisingly the crank isn't that damaged by just the looks but I could almost guarantee that it's bent haha.Cylinder's 3 and 4 let go completely. The block has 3 holes in it. I have never been able to actually see all the way through a block until now I did however bend the valves in cylinder 3 but the head is find besides those valves. I ordered the Maperformance Howard Rods and Wiseco 1400HD pistons. Nate at maperormance hooked me up with some awesome deals and I don't think I could have found anything better as far as prices. I'll try to post some pics up of the carnage when I get a chance.