Go Back   6th Gen Accord DIY and Performance Forums > The Garage > Engine & Transmission Mods

Engine & Transmission Mods Swaps, Turbo, Nitrous, bolt-ons, it all goes here

Register to remove these ads


Reply
 
Thread Tools Search this Thread
  #11  
Old 10-15-2007, 12:02 PM
turboputz turboputz is offline
Senior Member
Points: 3,296, Level: 16 Points: 3,296, Level: 16 Points: 3,296, Level: 16
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Sep 2007
Location: The District
Age: 36
Posts: 394
Rep Power: 44
turboputz is an unknown quantity at this point
Re: Engine Theory, Build, Etc Discussion.

Originally Posted by CHID0 View Post
Here it goes......If I'm thinkin about runnin 12+ lbs of boost whats the best CR for the block build? How do I achieve that compression?

I'm an engine noob......
Lower compression is usually achieved through the design of a new cast piston that you buy. It may be slightly dished like a bowl in some cases. This will increase the combustion chamber size and lower compression.

Compression can also be lowered through the use of a thicker than stock metal or copper head gasket. When the piston is at it highest point it will now be further from the roof of the combuston chamber. Again combustion chamber size increases while bore and stroke stay the same and compression lowers.

Changing of the headgasket thickness should only be used to achieve a small level of compression lowering. Meaning going from a 26mm gasket to a 75mm headgasket is a poor substitute for getting lower comp pistons.

8.3:1 to 8.5:1 compression is ideal for turbocharging above 15 psi on the F23. What that means is that with a good tune at this comp level you will be able to eliminate detonation and protect the longevity of the engine. Detonation is when the gas and air mixture explodes before the spark plug fires. This can cause knock and ping, which are both very bad things. Before this goes way over your head I will just mention three ways to combat detonation.

1: Adequately cooling the intake charge
2: Lowering compression
3: Tuning, tuning, tuning

Last edited by turboputz; 10-15-2007 at 12:04 PM.
Reply With Quote
  #12  
Old 10-15-2007, 12:12 PM
Kid2000EX Kid2000EX is offline
Senior Member
Points: 20,744, Level: 43 Points: 20,744, Level: 43 Points: 20,744, Level: 43
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Dec 2006
Location: Upper Marlboro, MD
Age: 31
Posts: 2,208
Rep Power: 52
Kid2000EX is somewhat reliable
Re: Engine Theory, Build, Etc Discussion.

I know ive been giving a couple answers but heres a question I have, Ive heard that by claybarring the motor, and running RSX-S pistons, compression should be in the 11:0-11:7 range. Is that true?
__________________
I crush Civics a 1/4 mile at a time! with just i/h/p/tp!!

Mike aka Kid2000ex- Member since December 2006 OG's 4 LIFE

2000 Honda Accord-Reliable Daily
1991 Toyota MR-2-Weekend Warrior *SOLD*
1986 Nissan 300zx T-Top Turbo *YEAH BABY DRIFT TIME*
Reply With Quote
  #13  
Old 10-15-2007, 12:19 PM
Roadrage's Avatar
Roadrage Roadrage is offline
Senior Member
Points: 11,903, Level: 32 Points: 11,903, Level: 32 Points: 11,903, Level: 32
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Jan 2007
Location: POPE AFB/ FT. BRAGG
Age: 39
Posts: 916
Rep Power: 47
Roadrage is an unknown quantity at this point
Re: Engine Theory, Build, Etc Discussion.

Originally Posted by BlkCurrantKord View Post
Ok, you have an a5 correct? I posted everything needed parts wise. The only things that you would want done by a shop are..

1) Hot Tank - cleans the block
2) Hone Job - preps the cylinder walls for new pistons
3) Balance and Assembly - unless you have some background or knowledge, leave it to the pros.

I'm not really sure what you mean by "will the stock engine work or convert to something else". Plugs and wires will stay the same, there's no reason why those would change.
yes its a A5. thanks for the info BLKCurrantKord
__________________
Tomorrow is never promised to anyone.
HID CLUB #203
Reply With Quote
  #14  
Old 10-15-2007, 01:30 PM
BlkCurrantKord's Avatar
BlkCurrantKord BlkCurrantKord is offline
Senior Member


Points: 47,607, Level: 67 Points: 47,607, Level: 67 Points: 47,607, Level: 67
Activity: 28% Activity: 28% Activity: 28%
 
Join Date: Sep 2005
Location: Ohio
Age: 35
Posts: 9,251
Rep Power: 119
BlkCurrantKord has their shit togetherBlkCurrantKord has their shit togetherBlkCurrantKord has their shit togetherBlkCurrantKord has their shit together
Send a message via AIM to BlkCurrantKord
Re: Engine Theory, Build, Etc Discussion.

Originally Posted by Kid2000EX View Post
I know ive been giving a couple answers but heres a question I have, Ive heard that by claybarring the motor, and running RSX-S pistons, compression should be in the 11:0-11:7 range. Is that true?
Are you talking about claying the motor or extrude honing cause I think you kinda combined the two with "claybarring".

Here's how to play around w/ the compression w/ K20 pistons...

K20a3 - dome = 2.5cc - should give around 11:1 compression
K20a2 - dome = 4.25cc - mid 12's to 13:1 compression
K20a - dome = 6.6cc - highest compression 13-14:1
__________________
Originally Posted by LoveLee
I would love a mushroom stamp after I pass the CPA
Reply With Quote
  #15  
Old 10-15-2007, 01:43 PM
Sonnick's Avatar
Sonnick Sonnick is offline
Senior Member
Points: 14,226, Level: 36 Points: 14,226, Level: 36 Points: 14,226, Level: 36
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Oct 2005
Location: Long Island
Age: 31
Posts: 1,283
Rep Power: 53
Sonnick is an unknown quantity at this point
Send a message via AIM to Sonnick
Re: Engine Theory, Build, Etc Discussion.

Originally Posted by Kid2000EX View Post
Ive heard that by claybarring the motor
Lol...are you talking about waxing your car? Hahaha just playin' man.

Hmm..so Jackhunt runs 11s and has over 400whp on stock rods

But anyway..........anything under 9:1 should be great for the F23 in terms of turbo. However, you can use the stock pistons/rods as well, along with ARP H23 head studs and ARP F22/23 rod bolts, just don't be silly with the amount of boost.

N/A..with the K20 pistons, etc, etc, you should be looking around 200whp, maybe a little more. See, the problem with these assumptions on 'how much horsepower' the F23 can achieve N/A with a mild build is that no one, at least from my knowledge, has done a true all motor F23 build.

But by the looks of what PirateMcFred did with the DOHC H23 and F22 heads on our block, 200+whp seems feasible.
__________________
06 ASM AV6-6 Coupe
I/PCDs/Jpipe/E/3.7 TL IM & TB/Runners/UR Pulley
272/235 SAE Corrected
Reply With Quote
  #16  
Old 10-15-2007, 02:31 PM
xci.ed6's Avatar
xci.ed6 xci.ed6 is offline
Senior Member
Points: 23,020, Level: 46 Points: 23,020, Level: 46 Points: 23,020, Level: 46
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Sep 2007
Location: Tampa Bay
Posts: 2,909
Rep Power: 56
xci.ed6 is more helpful than most
Member Photo Albums
Re: Engine Theory, Build, Etc Discussion.

Originally Posted by BlkCurrantKord View Post
There's a little more to it..

The F23 and K20 have the same bore and compression height in their pistons. The only difference is the dome or dish of the piston itself. This is what greatly changes the compression ratio. Also, your motor will not blow with 12-14:1 compression, it'll just require 93+ octane fuel or race fuel and some really good tuning.
everyone does. e85 = 105 octane, and cheaper than 91/92.
Reply With Quote
  #17  
Old 10-15-2007, 02:49 PM
DarkSideAccord's Avatar
DarkSideAccord DarkSideAccord is offline
nadeshiko fobz ftw..


Points: 129,084, Level: 100 Points: 129,084, Level: 100 Points: 129,084, Level: 100
Activity: 100% Activity: 100% Activity: 100%
 
Join Date: Sep 2005
Location: CA
Age: 37
Posts: 17,547
Rep Power: 101
DarkSideAccord should be someone you can trustDarkSideAccord should be someone you can trustDarkSideAccord should be someone you can trust
Re: Engine Theory, Build, Etc Discussion.

i never understood how one crank is better than another... more agressive? but how do i look at the numbers (if there are numbers)

also, not motor related, but how do i tell if a clutch is still good or not?
__________________

Originally Posted by Sketch o5 View Post
roy could live in Monaco, have won multimillion lotteries 7 times and hit $500k profit at a casino once a month, and he'll still be living in a ghetto and broke as fuck.

Reply With Quote
  #18  
Old 10-15-2007, 02:51 PM
BlkCurrantKord's Avatar
BlkCurrantKord BlkCurrantKord is offline
Senior Member


Points: 47,607, Level: 67 Points: 47,607, Level: 67 Points: 47,607, Level: 67
Activity: 28% Activity: 28% Activity: 28%
 
Join Date: Sep 2005
Location: Ohio
Age: 35
Posts: 9,251
Rep Power: 119
BlkCurrantKord has their shit togetherBlkCurrantKord has their shit togetherBlkCurrantKord has their shit togetherBlkCurrantKord has their shit together
Send a message via AIM to BlkCurrantKord
Re: Engine Theory, Build, Etc Discussion.

What do you mean by the crank Roy? Like as far as stroke?
__________________
Originally Posted by LoveLee
I would love a mushroom stamp after I pass the CPA
Reply With Quote
  #19  
Old 10-15-2007, 02:54 PM
DarkSideAccord's Avatar
DarkSideAccord DarkSideAccord is offline
nadeshiko fobz ftw..


Points: 129,084, Level: 100 Points: 129,084, Level: 100 Points: 129,084, Level: 100
Activity: 100% Activity: 100% Activity: 100%
 
Join Date: Sep 2005
Location: CA
Age: 37
Posts: 17,547
Rep Power: 101
DarkSideAccord should be someone you can trustDarkSideAccord should be someone you can trustDarkSideAccord should be someone you can trust
Re: Engine Theory, Build, Etc Discussion.

crank... as in the actual crank... i know it lifts the pistons, but tht's abt it i guess it is the stroke lol





i'm an crank noob
__________________

Originally Posted by Sketch o5 View Post
roy could live in Monaco, have won multimillion lotteries 7 times and hit $500k profit at a casino once a month, and he'll still be living in a ghetto and broke as fuck.

Reply With Quote
  #20  
Old 10-15-2007, 02:56 PM
Kid2000EX Kid2000EX is offline
Senior Member
Points: 20,744, Level: 43 Points: 20,744, Level: 43 Points: 20,744, Level: 43
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Dec 2006
Location: Upper Marlboro, MD
Age: 31
Posts: 2,208
Rep Power: 52
Kid2000EX is somewhat reliable
Re: Engine Theory, Build, Etc Discussion.

I would kind of like to know that too. At least knife-edging to increase stroke, I think!
__________________
I crush Civics a 1/4 mile at a time! with just i/h/p/tp!!

Mike aka Kid2000ex- Member since December 2006 OG's 4 LIFE

2000 Honda Accord-Reliable Daily
1991 Toyota MR-2-Weekend Warrior *SOLD*
1986 Nissan 300zx T-Top Turbo *YEAH BABY DRIFT TIME*
Reply With Quote
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


» Featured Ride
CHECK OUT THIS WEEK'S FEATURED RIDE!



Powered by vBadvanced CMPS v3.2.3