K24 Swap Parts Thread by SwapYour86.com and Pure Auto

[ka-t_240]

Originally Posted by venturaII

For those of us who plan to stay NA, I think having the option to purchase an adapter to keep the 86 transmission would be well worth it, compared to the headache of modifying the S2000 shifter, on top of the purchase price for that transmission, plus the need to use a different adapter anyways to connect the K motor and S2K trans... I get that the S2000 trans is stronger, but not everyone necessarily needs that in the first place.

The other thing to consider is, how is the BRZ gearing going to work with a K series powerband/rpm.

[venturaII]

Originally Posted by ka-t_240

The other thing to consider is, how is the BRZ gearing going to work with a K series powerband/rpm.

I think it'd work splendidly, frankly. You're talking two 4 cylinder motors of similar displacement and states of tune, not going from the FA20 to an LS with 3x the displacement and torque. K24x motors all have factory redlines that are slightly lower than the FA20. Factor in a tune that allows slightly higher rpms, and you're back on par with the FA20 in terms of usable rpm span.

And even if you used a K20A or Z head on a K24 bottom end, the K20 has an 8000rpm redline which is only 600rpm higher than ours. Remember that the K20 head on the K24 block will drop the K20 head's effective power range a few hundred rpm, and you're back in the same ballpark as the FA20.

[Irace86.2.0]

Originally Posted by Ashikabi

This guy makes a good point. What all is involved in an adapter anyways? I'm not familiar with adapting transmissions. Probably some kind of bracket for the bolts and then something for the driveshaft?

Unless I am mistaken, it is a custom bracket or a custom bell housing. Then it would be necessary to do a custom driveshaft and potentially a custom shifter. Even keeping the stock transmission may require all these components because the engine has been shifted closer to the firewall.

[venturaII]

Originally Posted by Irace86.2.0

Unless I am mistaken, it is a custom bracket or a custom bell housing. Then it would be necessary to do a custom driveshaft and potentially a custom shifter. Even keeping the stock transmission may require all these components because the engine has been shifted closer to the firewall.

http://www.ft86club.com/forums/showp...&postcount=112

[venturaII]

Honestly, the value in keeping the factory driveshaft is a little pointless, especially considering one of the big appealing features of this swap is weight reduction. An aftermarket aluminum driveshaft is a relatively cheap way to lose static weight (not even bringing up the rotational argument). So since an aftermarket driveshaft is already going to be on the list of mods that would support this project, it's a pretty simple thing to have it made to length to suit this application.

There IS value in keeping the factory shifter location though, so that would need further investigation.

[Ashikabi]

Originally Posted by Irace86.2.0

Unless I am mistaken, it is a custom bracket or a custom bell housing. Then it would be necessary to do a custom driveshaft and potentially a custom shifter. Even keeping the stock transmission may require all these components because the engine has been shifted closer to the firewall.

If the motor is closer to the firewall then surely the input shaft will now be too long right? Might have to move the motor forward if you want to keep the transmission. Otherwise if you move the transmission, the shifter will be wrong. Then you have a bunch more issues like needing the new shifter and transmission mount

[venturaII]

Originally Posted by Ashikabi

If the motor is closer to the firewall then surely the input shaft will now be too long right? Might have to move the motor forward if you want to keep the transmission. Otherwise if you move the transmission, the shifter will be wrong. Then you have a bunch more issues like needing the new shifter and transmission mount

IF all that is necessary to make the K motor fit, then there's less value to using the 86 transmission. However, you've still got to contend with the basic cost of the S2K transmission in the first place, which seem to be somewhat higher than what our transmissions are valued at, if you're trying to recoup some of your costs..

[ka-t_240]

Originally Posted by venturaII

I think it'd work splendidly, frankly. You're talking two 4 cylinder motors of similar displacement and states of tune, not going from the FA20 to an LS with 3x the displacement and torque. K24x motors all have factory redlines that are slightly lower than the FA20. Factor in a tune that allows slightly higher rpms, and you're back on par with the FA20 in terms of usable rpm span.

And even if you used a K20A or Z head on a K24 bottom end, the K20 has an 8000rpm redline which is only 600rpm higher than ours. Remember that the K20 head on the K24 block will drop the K20 head's effective power range a few hundred rpm, and you're back in the same ballpark as the FA20.

My friends K24 civic revs to 8500rpm. Makes way more torque and HP than my car on the same dyno. Its a stock K24 bottom, stockish head, cams, e85, bolt ons. IIRC it made 245/200 with a great powerband im comparison to the brz. Makes me want a K so much.

[Ashikabi]

Originally Posted by venturaII

IF all that is necessary to make the K motor fit, then there's less value to using the 86 transmission. However, you've still got to contend with the basic cost of the S2K transmission in the first place, which seem to be somewhat higher than what our transmissions are valued at, if you're trying to recoup some of your costs..

I agree that it would be considered. It certainly sounds both convenient and tempting for presumed cost savings. I'm not sold on it but I couldn't rule it out either

[venturaII]

Also, some really quick Googling shows the K24 motor is about 20" long, whereas the FA20 is 18". Not a lot of difference, which additionally lends itself to easier placement. Just food for thought.

[Ashikabi]

Nevermind. Dumb idea

[Irace86.2.0]

Originally Posted by venturaII

Also, some really quick Googling shows the K24 motor is about 20" long, whereas the FA20 is 18". Not a lot of difference, which additionally lends itself to easier placement. Just food for thought.

Just food for thought. Wouldn’t work with their current mounts as the input shaft is too long like Ashikabi said.

[spitfire481]

for what a custom adapter, flywheel/clutch assembly, etc would cost to mate the fa20 transmission to the k block, you could buy one of the multiple k to s2000 trans adapter kits already out there and a used s2000 trans. the time it would take to develop that whole setup, test, revise, test again, etc would not be worth it for the number of sales you could count on one hand.

[PolishFrs13]

I looked through your other K swap thread on here, i noticed the DBW TB.. is it the grams honda one ?