Well after much testing I felt like the Lysholm 1.6 L Twinscrew blower would be a better fit for the K24A2 motor. Erik Loza happened upon a great deal on a 04 TSX K24A2 and after a few bucks I was in business. I decided to go with the TSX motor because it has a head that flows as well as the Type-S and has more meat on the intake side to port out if I ever build the motor. With doing this it should be able to flow even better than the type-s. In addtion to this the TSX motor has oil squirters like the type-s as well as better compression and pistons than any of the other K24 motors around.

The motor will be used in its stock form outside of upgrading the valvetrain and cams to the type-s and a I will be using the S2000 oil pump as well. I decided not to run the type-s oil cooler since I will see max rpms of 7900 at most.

INFORMATION PRSENTED BELOW CAN ALL BE FOUND AT K20A.org

Stock specs:

K24A2 (RBB),TSX (CL)
200hp @ 6800rpm / 166lb-ft @ 4500rpm
7100rpm
10.5:1

Some info on the Cranks

Code -- Bore -- Stroke - rod length - crank throw - journals - weight

k20a - 86mm - 86mm --- 139mm ---- 43.18mm ---- 20mm --- 38lbs

vs

k24a - 87mm - 99mm --- 152mm ---- 49.53mm ---- 20mm

The TSX Head

Lagachette - The TSX head's have better air velocity than the Type-S . With the TSX, you will have higher flow rates at low lift but this advantage stops when you pass the 276 CFM line. After that the Type -S will continue to flow until 300 CFM. I think that the TSX has more potential than the Type-S has. If you can make a good porting on the TSX, You can go at 300 CFM with the advantages that the TSX had at low lift. But if you open the TSX head to much by porting it, you will lose the flow at low lift that is for me really important. It is that, that gives the torque. It is not only the maximun CFM that we have to considering in the dyno flow. The most difficult thing to do for a head porter is keep a good flow at low lift and incerasing the top flow at the same time. A lot of head porters think that they are good with impressive top flow numbers but they forget that velocity is also important for performance and torque... By the way, I did a test to compare valves on the stock TSX head with :Manley, Supertech, Skunk2 and stock valves. The Skunk2 are the best, after that, the Supertech are really close, Manley was third. With aftermarket valves, you will have around 7 CFM gain in all the range. But don't forget that if you make a porting, all these results can change. One kind of valve can give a better result with the kind of porting that you did. It is a lot of work to make a good porting and a valve combination. Also, you can tell your porting men that it is better to stay at 3 angles at the intake. I have lost 10 CFM with 5 angles... If you want good informations about that, You can check the 2006 february Sport Compact Car magazine. They did a porting work on a K24a2 head. There is a picture of porting. But for me, i think that they opened the k24a2 head a little to much...

Driving Styles

Here it is a question of taste. If you like to rev your engine you choice will be the k20 but if you like the torque the TSX block is the best choice (the torque on the TSX start at 1.8k at 150pound!) Personnally, in the street, I prefer torque. If you use the TSX block you will have more compression than the K24a1 block that have 9.6:1. It makes a notable difference in power. Also, the TSX block is a better block than the k24a1 is. The TSX have an oil stream under the piston to keep them at the good temp. The TSX block have better rods and bearings this block is set to rev by the factory at 7.1k and the k24a1 at 6.5k.

Piston Speeds

The actual bolting on part wouldn't be too difficult, as the heads should mount right up. However, you do run into an issue with piston speed. At its 7900-rpm redline, the K20A2 in the Type-S has a piston speed of 4464 feet per minute (fpm). Thanks to its long stroke, the K24A1 comes close to that, running at 4225 fpm at its much lower redline of 6500 rpm. By the time you've spun your K24 up to just 6900 rpm, you're already at 4485 fpm, and at the 7900 rpm redline of the K20A2, you're at a crazy 5135 fpm. For comparison, even the hyperkinetic S2000 with its 9000 rpm redline doesn't exceed 5000 fpm (it maxes out at 49% fpm). And the Integra's B18C1 only reached 4573 fpm. Translation: If you're going to plunk a K20A2 head on a K24A1 block and redline the concoction to 7900 rpm without seriously building up the bottom end.. Duck.