apeximprt2nr

iTrader: (7)

Hey guys I am looking to build a road race car for this season. I have the suspention setup pretty much picked out and now its choosing a good motor and turbo. I am going to keep stock intake manifold for a quicker spool and most likely go with an HTA 3586. What would be a better choice of a motor a long road 2.4 or a 2.3? Pros and Cons of each?

Also what else would be a good engine modification for road racing....long hours of hard driving=alot of stress on the motor...

JohnBradley

iTrader: (30)

What RPM ranges are you thinking about being in and how long on course? I would personally run the longest rod with the most moderate stroke possible. The 2.2 really seems to be a good split between R/S ratio and increased displacement.

Erik@MIL.SPEC

iTrader: (94)

I know less than 10% of what Aaron knows (and that's probably overstating things for me), but my layman self is beginning to appreciate the 2.2 with regards to being able to spin it while having lesser side-loading than a 2.3 using a 4G63 block. AMS used a 2.3 for a season of TA, so you certainly can use a 2.3. But the piston speeds in the 2.2 will allow higher revving more safely.

I plan on running a custom long rod 4G63 with a 94mm crank. That I think will balance my desire for higher displacement and have a rod ratio close to the stock 1.7.

apeximprt2nr

iTrader: (7)

I plan to be spinning up to around 8500-9k...yea the 2.2 is becoming very popular I know Greg from GSC made a 2.2...have you heard anything about a long rod 2.4 spinning up to 9k?

apeximprt2nr

iTrader: (7)

Yea the 2.2 has become very popular and of course the 2.3 ran by AMS has proved to be awesome...I am looking to see if any has ran different setups and get opinons on what they liked best with what turbo.

E7R

Marco at Magnus builds some very good setups,have a look there also.
A 2.2 long rod can rev more than 9k easily

JohnBradley

iTrader: (30)

Well the only way to do the 2.2 the way we are offering them is to use a 4G64 block to get better than stock R/S ratio. The other 2.2s have been long rod 4g63s which are still good but the 4G64 allows the envelope to be pushed a little further.

In a '63 with a 94mm stroke you can safely without too many issues run a 156mm rod and this would get the R/S back to 1.66 (stock is 1.704) so it would be really close. You can do the some similar things in the '64.

You could always do an 86x92 motor and be really close to 2.2L and have a RS of 1.695 (about stock really). The displacement ends up being like 2140 with that one.

Seems as though its time for another thread

jimbobdaga

which has better rod angles?

JohnBradley

iTrader: (30)

All depends on the stroke and rod length. Its harder to get good angles out of a longer stroke motor unless you make some compromises somewhere.

If we run with stock being "ideal" or at least a target you need to keep the rod length to stroke ratio at 1.7 as Erik and I pointed out.

MJ23FE

iTrader: (3)

Great thread. I'd love to see this discussion expand.

If I ever rebuild my block, I want to be able to rev to 9k all day. Yeah yeah yeah, powerband, why rev that high if you're not making the power. I will get a turbo that will!

-Jalal

apeximprt2nr

iTrader: (7)

anyone have experience with a 2.2 with an HTA 35??

apeximprt2nr

iTrader: (7)

Yea...I wanted be able to rev high thats why I had the 2.1 built with aluminum rods...I have heard from a few people that the 4G63 2.3 with a aluminum rod is the way to go for road racing. HTA3586 combined would have 500hp on pump and good spool.