I just bought a 1993 prelude si for 6k..... it has a Jasper remanufactured h23 motor in it with only 18k miles on it. I know Jasper bored it 50 over but Im not sure how good the parts are in it.... Im wanting to reach about 220-250whp without boosting..... How would I go about doing this? Im wanting to find a h22 vtec head to mount on the block for the vtec cause ive seen it done b4. Right now the car has a fully built suspension, dc racing catback exhaust, falken rims and tires, Venom fuel injectors, MSD ignition box, Toymachine racing cold air intake, not sure what but it has a performance clutch.... will pull out all reciepts to find specifics.... I dont want to get a new motor since this one is basically new but im wanting as close to 250-300hp as possible without boosting.... What should I do to get this. Thanks

 

Can someone give me a list of parts to do this conversion.... Because the block is bored 50 over whats safe to rev it to.... stock motor redlines at 6400..... ive taken this jasper motor to 7k w/o problems but can i take it higher? Is Vtec'ing this block worth it? Or can i get 250hp w/o vtec...

 

I don't think its possible to bore .050 out of an H23 safely, you may want to check into that

 

here is the site of jasper engines

http://webapp.jasperengines.com/webcat/catalog.asp

 

What I'm wondering is why did they replace the injectors with 240cc Venom's when stock are somewhere between 235-245 (can't ever get a straight answer but 10cc doesn't really make a difference)

 

Is this Jasper motor worth keeping and fixing up or should I switch to an H22.... i found an H22a Vtec type S motor for about $3600 plus shipping.... Dont wanna get a new motor if i can get this one up there.... ShouldI spend the time to Vtec this?

 

Just swap on an H22 type S head!

https://honda-tech.com/zerothread?id=510617

 

It's up to you, not us. There's a lot of 'iffy' stuff on that mod list, but I say if the engine is running good and has good compression, then do some research and you can make good power with it. You will not get 250-300 without boosting though.

 

1. Power Stop PWR-JBR-307 cross drilled, Zinc-dichromate plated all 4 $160
2. Ingalls Engineering Adjustable Camber Kits $57
3. KYB AGX Adjustable Gas Shocks and Struts front $180
4. KYB AGX Adjustable Gas Shocks and Struts rear $180
5. Matrix Coil-Over Kits $120
6. VENOM Fuel Injectors 240.0cc $240
7. Catco Direct Fit Catalytic Converters $93
8. NGK Iridium IX Spark Plugs all 4 $28
9. MSD SCI-L CD Ignition box $244
10. MSD 8.5mm Super Conductor Spark Plug Wire Sets $65
11. RAM Premium Replacement Clutch Sets $300
12. Energy Suspension Motor Mounts/Motor Mount Inserts $38
13. Falken Torque 5 17x7 gloss black with polished lip…. With falken tires $850
14. Jasper Reman. Motor h23a1….. $3627 website says its been bored and mechanic who dropped in said it was done 50 over so I dunno
15. DC Racing cat back exhaust… 2.5” pipe I believe

This is what I want to add to it….. Please feel free to say changes to this…..
1. Crower Cams
Stage 3 - Full Race





Rough idle. RPM Range: 1100 to 8000+
Int- 255
Exh-255 Int- 215
Exh-215 Int- 451
Exh-451
$420/pair
2. Crower Spring Kit for the cams KIT H23 HONDA WITH TI RETAINERS & SPRING SEATS
- $419.53
3. Supertech Performance Valves
4. or what about the KMS Ultimate Valve Train Package? Will this work with the crower cams and I wont need the spring kit from crower? $600
5. Magnaflow High-Flow Catalytic Converter
6. kms high flow oil pump $190
Now Im getting an H22a vtec head so with that Im getting, (correct if wrong) and will a stock h22a head directly mount on a bored h23 block….. does the block being bored make a difference in the head? Lol yes im new to this
1. Skunk2 Camgears
2. Megan header MR-SSH-HP92VT $190
3. h22a thermostat housing…. $10 at autozone….sound right?
4. FENCO_REMAN Water Pump $31 @ autozone
5. h22a waterpipe
6. headgasket around $60
7. h22a power steering braket
8. h22a top timing belt covers
9. Venom Drag Intake Manifold VNM-M21-335B $580
10. h22a Venom injectors… what cc should I go with?
11. h22a plug wires
12. h22a head bolts
13. h22a lower crank gear…. What exactly is this?
14. h22a plug wires (what are these)
15. what all sensors need changed?