is it called "strocked"? and whats the widest piston i can use with k24 walls without a block gaurd?

 

Wow, sounds like your venturing into quite a build. If I were you I would try to find a sponsor for such a build project lol.

Only advice I can really give ya is if you only got 91 in your area it will really limit how high of compression you can run. Unless you don't really care about engine longevity. I would make sure you really know what your doing before changing the airflow design of the head. It already is very efficiently designed. Especially the Frank that your doing.

I think it would be easier to achieve higher compression looking at stroke length and piston dome design. I'm pretty novice in this area still.. but I would think it would be harder to increase compression if you bore the block increasing the volume of the combustion chamber. But rather would help to increase torque, as well as power in the bottom end.

 

My town is too small for sponsors :/

We have 110 and 100 but I rather not spend my time mixing and spending a lot on gas
The head and manifold of already ported. Along with 3angle valve job

Changing the stroke requires a $1000 crankshaft no?

 

Currently I have a 03 ported k20a2 head and a stock 08 k24a2 block. I wanted to change my stock pistons to high compression and my stage 2 cams to stage 3 cams. Then I thought I might as well bore out my block.
1.Would this be beneficial to my set-up? Not unless you do it right
2.if so what size do i bore out to? 88-90mm is what I see in high power NA
3.What size pistons do I buy? The same size as your bore
4.I have to buy aftermarket K24 rods to rev higher correct? It is recommended as well as an oil pump
5.Is there anything else i need to buy to bore out my block? If you want to go above 88mm you need to sleeve the block
6.What is the highest compression i can run on this setup using 91 octane gas? I would only recommend high 11's but you may get away with 12.5:1
7.Would i still be able to use 100/110/e85?(if my city decides to carry it one day) Yes with a separate tune
8.Anything else i should keep in mind?

This is going to get very expensive

Answers in bold

 

Honestly dude, I don't mean to sound like a douche here but you are asking a lot of noobish type questions to be jumping into such an elaborate build. I don't know a lot about everything which is why I kept my build fairly simple. I think you may be better off doing the same. I've seen you posting about it in like 5 threads already, is there a particular reason you are so dead set on having a k25? Are you looking to get into competitive racing or something? Why is the 2.4 not enough for you?

 

I understand my questions are not all that complex. Trying to learn fast because I have my entire motor in price and I need my car back on the road. So trying to do something that's been said and done already. It's just a "well while I'm here" Honda thing. I was just trying to have a k25 to be different. But looks like I won't be able to afford that. I will still be the first Frankenstein in town. There is no competion. Car will still be used Daily. I had a stage 2 motor setup ready to go. But I decided I would be a bit happier with a stage 3 set up. The 2.4 is going to have to be enough

 

they will not be the same price due to the price increase of getting the block sleeved to achieve the 2.5L displacement... you are going down a very expensive road my friend

 

also if you wanted to stay with that compression ratio you would have to retard the timing drastically to run the lower octane fuel

I don't want to sleeve it. Just install a block guard. Bore out with 12.5 pistons and rods.
I'm leave the tuning to a professional

 

also if you wanted to stay with that compression ratio you would have to retard the timing drastically to run the lower octane fuel

 

keep it simple 87.5mm bore & the same 99mm stroke using 12:1 or 12.5:1 pistons with your ported head should net good power, who ported the head?

 

I went with 87.5mm 12.5:1 weisco pistons with k24 eagle rods. Now I just need to find some stage 3 or 4 cams

 

I also bought some drag cartel stg 4 cams.

At what rpm will my motor stop making power?
Will the eagle rods be able to go that high?

 

how much clearance do you have with this bigger cam and domed pistons? who ported the head? you wont really know what rpm the motor stops making power...

 

my stock K20z1/K24a1 pulled on most my friends k20 set ups (rsx/civics). Honestly you can achieve great number with what you already have. 300whp to a Honda will smoke a lot of things. IDK why you going so hard unless you were gonna drag it a lot. BOM has a pretty simple set up and i'm sure he pulls a lot of people. With my old set up(K20z1/k24a1/tsx cams/injectors/street tune/full bolts on) i was running stock evo xs on rolls, my friend even had to turn up his boost evo x to beat me. All that money you would have spent on that elaborate build can be used to make a nice tranny and have a long living motor/tranny.

 

Really isn't a lot that I'm doing. Cams, springs retainers, pistons, rods, bigger block. No biggie. It's just a while I'm here kinda thing.

 

Only down fall is that I had to learn about different products and their specs in a short amount of time. I'll be lucky to hit 300 whp

 

who ported the head?

 

just a regular machine shop. nothing fancy

how much clearance do you have with this bigger cam and domed pistons? who ported the head? you wont really know what rpm the motor stops making power...

I have 4.5 drag cartel cams. they tell you that you have a 35 degree limit with aftermarket pistons. no, I don't exactly know, but I was looking for an estimate from people who have done this already

 

^Send me your motor i'll put it to good use.

 

I wasn't aware a motor isn't being put to good use unless being raced

 

Did u install the cams yet? I'm looking to upgrade to fully ported head, I'm about to install a fully ported rbc

 

That's what I'm doing as we speak. Just waiting on a new head gasket and a tensioner. I also ordered circuit Heros lower timing chain guide.