S1 Exige With Built K20a2 Rotrex Blower Etc.

[ggelise]

A quick note if there is anyone following this. We mocked up a 2.4 block (taller by almost 2 cm) and everything will go together without any drastic changes so we are going to do a 2.4 block on the k20a2 head (Honda kids have been doing this for some time.) Torque increases by some 25% or so and will add about 20% more hp. Not messing with the cams or anything else. So, just waiting on the short block (not being built by JG.)

Lower revs and compression but big boost in torque and HP with very low cost. The 2.4 engines are dirt cheep as are the forged internals ($800. will get you top shelf rods and pistons). The block just slides in but the taller deck requires use of the k24 timing chain, cover, and guides. Everything else, oil pump etc., are carried over from the k20. The CRV block is the fist choice but the accord and others all work fine from what I've read....... we'll see what happens in a few weeks.

[david hasselhoff]

ggelise

....or anyone know where i can get (an elise like) race car suspension alignment and cross wieght balanced?

im in the SD area but i suppose i can make it OC, LA if i have to...

sorry for the hijack.

much olige for any leads.

DH

[ggelise]

Hey Man-

I would contact DRS and see if they do geo. We are not that far along yet but they will be our first call.

[david hasselhoff]

cool

thanks for the recommendation... well give em a ring

cheers

dh

[Mase]

Id recommend using the s2000 oil pump instead.

[ggelise]

Hey Mase-

I think the new pumps have solved the cavitation problem-remember looking into this. Also this thing won't be revving above 8k- I will double check. Thanks for the heads-up.

[dstevens]

There never was a cavitation problem with the K20A oil pumps. One person used 'fear, doubt and uncertainty' to promote their solution to a non existent problem, which unfortunately got magazine coverage and then become part of internet folklore, indistinguishable from fact. Oil pump cavitation results in metal pitting from the bubble implosion - which I've even heard mentioned in association with K20 oil pumps. We've also not seen an oil pressure drop on 10,300 rpm dyno runs.
The only comment I'd have is that many people run oil which is too light for the operating oil temperature. 5-30 is great for a street car or drag engine, but not so good for a race engine.

[ggelise]

Short block is in da house

-k20 a2 head
-10 to 1 compression (CP pistons)
-Forged con rods
-k24 sleeved block
-balanced assembly etc.

A hard-core enthusiast on SELOC (wayne) finished an unbelievable Audi conversion with over 500-hp...the thing has approximately 600-hp per ton (pic a few pages back). So, was thinking how this compares to a bike. Not the fastest Super Bike, but a 1198s Duc for example has a wet weight of approximately 410lbs with an additional 160 lb. rider your talking 570 pounds being propelled by 170 hp. So, 1 hp for every 3.3 lbs. So, if wet weight with driver is near 1,600 and hp hits 500 then this combo should accelerate like a bike at least up to a certain speed when drag becomes a factor or, am I missing something? Wayne said his New R1 would have his Lotus but I bet it would be close for most sport bikes.

Mark has Sean Church doing the tune. Sean is a very cool dude and the best Honda tuner out there according to Doug the Hondata founder who is another great guy who has been very helpful personally and with his great products. Doug has a TSX engine in his s2, we have the poor man's version of his setup.

Read about a few of the older Voltphreaks batteries (those without the over/under-charge protection) having issues. So contacted them and they were great about adding this protection free of charge. Just send her in and they fix it for free. It is great when a company takes the risk to bring new technology to market and then stands behind it like they do. Gold stars for Voltphreaks.

[ggelise]

More Progress:

[ggelise]

As mentioned, the k24 block slides in but is 1.8/1.9 cm taller. This will require a little adjustment fitting and Mark may have to make a few adjustments with the exhaust.

The taller block requires use of the 2.4 timing chain, guides and cover. Crank pulley is carried over from the K20 to keep things spinning at the correct speeds. The Rotrex boost is determined by the crank and blower pulleys as you know so good to get this correct. We have it spinning at 100,000 which translates to 14 up to 15 lbs of boost on the k20 (this will drop down some with added displacement of the 24)

[skibum]

It's lookin good. Great idea to use the zip ties to keep the vtec pins from falling out. Wish I would have thought of that when I did the head gasket on my s2k.

[dstevens]

Originally Posted by ggelise

... the best Honda tuner out there according to Doug the Hondata founder who is another great guy who has been very helpful personally and with his great products. Doug has a TSX engine in his s2, we have the poor man's version of his setup...

I believe you are confusing Doug with myself. I heard the tuning went ok.

[Clarque]

Amazing build.

I have lurked this site for years, but this car finally made me sign up tonight. Is this car still at MD?

Sean Church is the best tuner for the K-series engines. When Hondata was starting it's development of K-Pro, Church Automotive was right next door (thats why he is such a pro with it). I had Sean tune 3 of my K-series cars in the past 4 years, awesome guy and knows his stuff.

If you dont mind me asking...Which Cams have you decided to go with?

-Ryan

[ggelise]

Amazing build.

I have lurked this site for years, but this car finally made me sign up tonight. Is this car still at MD?

Sean Church is the best tuner for the K-series engines. When Hondata was starting it's development of K-Pro, Church Automotive was right next door (thats why he is such a pro with it). I had Sean tune 3 of my K-series cars in the past 4 years, awesome guy and knows his stuff.

If you dont mind me asking...Which Cams have you decided to go with?

-Ryan

Hey Ryan-

It is amazing how many of these guys know each other from the old days! Yea the car is still at MD-the engine is not yet completed so it is still out of the car. If you are in the area, Mark is an awesome guy- stop by and say hello. Shoot me a PM and we will call ya to come have a spin when the day comes (I am in FL). Still have to do geo etc after tuning so it will be a little bit. What have you done with your projects? We did not mess with cams but our goal is a good number that will hold up fairly well and I am running out of $

Ryan sounds like you have a lot of experience, if you have any suggestions for us let em rip.

I believe you are confusing Doug with myself. I heard the tuning went ok.

Sorry for the confusion! We have not tuned the car yet. Did you do your own mounts etc for the s2? Would love to find out more about your car...

It's lookin good. Great idea to use the zip ties to keep the vtec pins from falling out. Wish I would have thought of that when I did the head gasket on my s2k.

Thanks man- Mark has done this for ever-knows all the tricks. Where do ski? Board out at A-basin quite a bit but have not used shaped skis (showing my age) yet heard that they are amazing.

[skibum]

Originally Posted by ggelise

Where do ski? Board out at A-basin quite a bit but have not used shaped skis (showing my age) yet heard that they are amazing.

I was raised in Park City, UT but my favorite spot has got to be Jackson Hole, Wyo. Raw, untouched terrain with gobs of perfect snow.

[ggelise]

I was raised in Park City, UT but my favorite spot has got to be Jackson Hole, Wyo. Raw, untouched terrain with gobs of perfect snow.

Wow, never been to Jackson Hole but it is now at the top of the list. Was trying to get out to Silverton this past season as it is said to be sort of similar but way more rustic (they only have 1 lift that is diesel operated and the Silverton logo is of a skier falling off a cliff!)

What type of FI are you running on the s2000 that's making those numbers? Love to see all that torque! Ducatis, S2000's lot of guys here own the same toys.

Saw an on-track vid of a guy in Canada with a Honda lump in an old-school mini and that thing would scoot! You must know about Z-cars with those sub 3 second minis. Early on thought it would be cool to get an old s1 and have them put a busa motor in (sort of a cheep Radical) but it wasn't that cheep for such a limited use car.

[Clarque]

Originally Posted by ggelise

Hey Ryan-

It is amazing how many of these guys know each other from the old days! Yea the car is still at MD-the engine is not yet completed so it is still out of the car. If you are in the area, Mark is an awesome guy- stop by and say hello. Shoot me a PM and we will call ya to come have a spin when the day comes (I am in FL). Still have to do geo etc after tuning so it will be a little bit. What have you done with your projects? We did not mess with cams but our goal is a good number that will hold up fairly well and I am running out of $

Ryan sounds like you have a lot of experience, if you have any suggestions for us let em rip.

I'm so going to check out this car at MD...its about 1 mile from my house.

I onced owned an RSX-S and was one of the first to run the Greddy Turbo kit(which was the first one out and Jackson was still developing the SC). A lot of people were having problems with their setups at the time. I was just lucky to be deep into the community when all of the new products and setups were coming out for the K-Series. I never messed with the internals on my K20A2, but I was putting down 295WHP 220TQ at 9 PSI. We soon discovered that was the limit for the stock internals as a rod came out to see me one day. I was the first one to run the AEM EMS as engine management and regret it to this day. Too much functionality for what I was doing, but the K-PRO is by far the most user friendly EM I have used to date.

Another RSX-S (My buddy's car), all NA, K-PRO, Headwork, Forged internals,STOCK CAMS, 12:1 Compression (IIRC). 235WHP 194TQ. Church tuned it and was shocked at the results. Sold his car to some noob college kid, with the KPRO and built motor still in the car, the kid still doesn't understand why vtec kicks in so low and never even put a cold air intake on it....damn shame.

I currently own an 04 STI and my budddy an EVO 9. too many mods, but just too much fun. My next car will be an Elise or a Catterham/Birkin. I just cant wait for prices to drop when the Evora gets out and popular. I miss the K-series....such a strong engine with so much potential.

Anyway, back to our regularly scheduled drooling over your car.

-Ryan

[ggelise]

Hey Ryan-

So-Cal is definitely the World-wide epicenter for anything car related. It is cool that you have been in the middle of the scene out there to see it all evolve. Give me a report back if you go by-as I have not made it out yet. love the subies especially the harder edged versions from a few years ago like yours!

Cheers

[ggelise]

One more pic

[dstevens]

Not wanting to rain on your parade, but I see a crank pulley with no inertia ring - not a good idea.