Topic profile page for Compression Ratio.
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Topic "Compression ratio" was discussed 11,607 times on 1,037 sites in last 3 months
Started 4 days, 18 hours ago (2009-11-24 14:30:00)
by RileyF100
I was wondering if anyone knows what my compression ratio would be if I get a rebuild kit that boasts 9.5:1 with 54cc heads and I will be putting on 64cc heads. Also, how can I raise the compression to 9.5 being that it will inevitably be lower than 9.5.
Started 4 days, 21 hours ago (2009-11-24 11:41:00)
by AkumaMotorsports
Hello NASIOC! CP Pistons has released new 9.0:1 compression ratio pistons for the EJ255/EJ257. These shelf pistons now give 2.5L owners the option to use an 8.2:1 or 9.0:1 compression piston. CP pistons have become one of the most popular choice of pistons when it comes to motor builds. These are going to be readily availble at Akuma Motorsports starting November 20th! Pm me for best pricing!...
Started 4 days, 22 hours ago (2009-11-24 10:19:00)
by greentengu
Hey CFM: Can you tell me (and anyone else who's curious) what the advertised compression ratio is for these pistons?: Focus Central / Probe Lightweight Pistons for '00-04 Focus Zetec/SVT/ST170 Item Number: FC-26 Thank you. Cheers, Scott
Started 1 week, 2 days ago (2009-11-20 04:12:00)
by 60veedub
I just put together my 2110 motor, and the compression is about 8.7 to 1. I was wondering if I should up it to about 9.3. Would that make any noticeable difference in the way it runs or should I leave it the way it is? 2110 web 86b 42x37.5 cb mini wedgeports 44 idfs 1 5/8" sidewinder 1.4 scats
Started 1 week, 3 days ago (2009-11-18 15:07:00)
by Trollspray65
Guys, I hope this isnt a repeat. I have searched the web, this site and many others with out success. I need confirmation on static compression ratio for my 2003 GT 4.6. I am rebuilding with an Eaton 112 and I am trying to decide on what my new compression ratio should be. I feel I cant know that w/o knowing what it was stock. I have seen numbers ranging from 9.1 to 1 up to 9.7 to 1 stock for a ...
Started 1 week, 4 days ago (2009-11-18 00:23:00)
by Yspen
My 2F rebuild now needs to go oversize pistons 0.060" (due to damage on no 5 cylinder wall that makes overbore essential .) My plan is to end at 9:1 compression ratio max . How does the overbore effect the ratio ? Do I need to skim more or less off the head to get to 9:1 ? What will the displacement be with overbore 0.060" ? Does overbore give more power ? How does it affect fuel ...
Started 1 week, 6 days ago (2009-11-15 20:54:00)
by CcanDo
Assuming it is safe to use an initial compression ratio of 8.5 to 1 and 5# of boost for a final of 12 +, on 93 octane, why is not accepted to run 12 or 13 compression, naturally aspirated ?
Started 1 week, 6 days ago (2009-11-15 20:42:00)
by tupakiz
hello guys i want know if i am putting a turbo kit together, i have read a higher compression ration is better or not? also someone can explain me or has a article about compression ratio why higher compression ratio is required than a lower, how about to calculate compression ratio because i want know for my knowledge thanks.
Started 4 days, 3 hours ago (2009-11-25 05:11:00)
by 1978CobraII
Some of that airplane fuel might be leaded. Stuff is like 112 octane. My mom ran it in our small rototiller once. Ran like a raped ape for about 15 minutes until it overheated.
Started 1 week, 1 day ago (2009-11-20 18:23:00)
by RWD fords rule
Quote: Originally Posted by SidewaysMk1 gp1 cam needs wat compression?? 3500-8000rpm. 313in 311ex duration. this cam selection ting is harder than it seems. At least 11.5 to 1 Yes cam selection is not that easy, generally though you should go the the highest valve lift you can get with the shortest cam ...
Started 1 day, 15 hours ago (2009-11-27 17:40:00)
by copbait73
Quote: Originally Posted by Ken911 i just switched to a 3.4 with 7.5/1 JE pistons and a 1 bar spring. this mean i have a ticking time bomb? I still am breaking it in and havent re adjusted the WUR for the new compression and displacement. Id forgotten about this thread until your posting brought up a prompt....
Started 1 day, 19 hours ago (2009-11-27 13:32:00)
by 63mako
Quote: Originally Posted by Rmorgan&11 63 Mako Thanks for the update on Cometics I Definately don't want to steer someone in the wrong direction / I had mine custom ordered and they came with a slip of paper stating to use sealant . Its been quite awhile since I ordered mine...
Started 5 days, 6 hours ago (2009-11-24 02:17:00)
by manousos
Quote: Originally Posted by SteveFX Anyone that can gloss off BMW Vanos as flawed because of " LOST MOTION" ; while espousing a flailing cylinder head is either a moron (lacking the least understanding of mechanics/physics), or a nuisancebot. I'm done BMW Vanos is not a "LOST MOTION" something. Vanos and ...
Started 1 week, 1 day ago (2009-11-20 14:51:00)
by DarthWeber
With your CR of 8.7:1 your dynamic CR is down around 6.5:1 which is fine if you want to run regular gas, but it sort of defeats the purpose of the 86b cam. You are leaving a lot of performance on the table. If you up it to 9.3:1 then you'll have just under 7:1 dynamic. Do that and keep your deck height right around 0.050" and it will run just fine on premium gas. My two cents.
Started 5 days, 7 hours ago (2009-11-24 01:38:00)
by 04Ryan
Quote: Originally Posted by 570cobra96svt Yea i figured that, the "sidebolts", are they actually the horizontal main bolts? or can you only access the horizontal mains by removing the oil pan.? Yea girdles are a waste on a mod motor...and yes the side bolts are the horizontal main bolts. It's 2 part though......
