street motor compression

Old 06-05-2007, 10:48 AM
  #1  
zano
Member
JUNIOR BUILDER
Thread Starter
 
Join Date: Feb 2006
Posts: 72
Default street motor compression

bought street motor from bowers 632 c.i. was suppose to have 10.5 compression it has 11.3 is this to much for street?
zano is offline  
Old 06-05-2007, 10:49 AM
  #2  
lotsof454sss
Senior Member
DYNO OPERATOR
 
Join Date: Apr 2006
Location: North Georgia "GODS COUNTRY"
Posts: 539
Default

I just have to ask....Did you read all the post here before you bought your engine??
lotsof454sss is offline  
Old 06-05-2007, 10:55 AM
  #3  
zano
Member
JUNIOR BUILDER
Thread Starter
 
Join Date: Feb 2006
Posts: 72
Default read posts

some are my posts bought engine way before posts just got it a couple of weeks ago
zano is offline  
Old 06-05-2007, 11:25 AM
  #4  
bjuice
Administrator
RACING JUNKIE
 
bjuice's Avatar
 
Join Date: Apr 2003
Location: Greenville s.c.
Posts: 3,239
Default

to answer your question...NO...its not too much for a naturally aspirated street engine...you want to make sure you keep good gas in the motor...the Amoco 93 octane white gas is good stuff...11 to 1 compression is about the highest you would want to go on pump gas street motor ( my opinion).....do not SLIP and put some cheap gas in that motor cause its right there on the border...


i do not know if you have access to racing gas at the pump..
here in my home town they have leaded racing gas 110 ast the pump at some stations....it would not be a bad idea to run a couple of gallons of 110 with every 10 gallons of 93 octane...

i mean look....you need some compression to make some decent HP....I DO NOT think you would have appreciated that 632ci motor if it were a 9.5 compression motor..it would have been a slug...( my opinion again)
not taking up for bowers just telling you how it goes...compression makes HP.......understanding there is a limit to what a street motor needs to be.

i have had more than one 11 to1 compression street motors..as a matter of fact i had some of the fastest 406ci street pump gas 11 to 1 motors in town at one time..

just curious...how or who did you have figure the compression when you got it back from bowers ?

Brian
__________________
Bjuice..

"I'M YOUR HUCKLEBERRY ! "
bjuice is offline  
Old 06-05-2007, 11:31 AM
  #5  
sp2816
Senior Member
MASTER BUILDER
 
Join Date: May 2003
Location: Owingsville, Ky
Posts: 157
Default

zano wrote:
bought street motor from bowers 632 c.i. was suppose to have 10.5 compression it has 11.3 is this to much for street?
Other factors come into play, such as the camshaft timing and fuel that you are planning on running. But, IMHO for "street" driving and 93 octane fuel, I would say that it is too much compression.

As I calculate, the overall chamber volume needs to decrease by about 10cc's to get to 10.5:1 and 18cc's to get to 10:1.

Bill M
sp2816 is offline  
Old 06-05-2007, 12:28 PM
  #6  
zano
Member
JUNIOR BUILDER
Thread Starter
 
Join Date: Feb 2006
Posts: 72
Default figuring compression

bowers just sent me the cam card dyno and compression ratio yesterday it was suppose to be 10.5 he said its 11.3 ross flat top pistons comp can 785 766 gross lift 278 290 duration at .05 also seems like alot of cam for the street dynoed 945 at 6000 rpm comp cam says it will not idle good bowers says on dyno it idled at 850 real nice also said flat top pistons burn better and alum. heads them 2 things make it so you can get away with 11.3 comp. i hope he is right what do you think no racing gas around here but 94 octane sunoco
zano is offline  
Old 06-05-2007, 12:56 PM
  #7  
mcracecars
Senior Member
EXPERT BUILDER
 
Join Date: Dec 2006
Posts: 272
Default

I would have a difficult time beleiving the engine has or is anything he says it is.
It is probably a big block of some kind.... check it out...
mcracecars is offline  
Old 06-05-2007, 01:14 PM
  #8  
woodsman
Senior Member
DYNO OPERATOR
 
Join Date: Mar 2007
Location: Texas
Posts: 525
Default

zano he has never told the truth before why would he start now just my 2 cents. Wesley
woodsman is offline  
Old 06-05-2007, 02:11 PM
  #9  
bjuice
Administrator
RACING JUNKIE
 
bjuice's Avatar
 
Join Date: Apr 2003
Location: Greenville s.c.
Posts: 3,239
Default

ZANO- have you run the motor ? and if so what have you used as fuel ? or what was the fuel used on the dyno ?

also street use means different things to different people...to me street use means driving it to a local cruise inn on a Saturday..
for some it means driving it back and forth every day to work and 500 miles one way to a vacation spot.


Brian
__________________
Bjuice..

"I'M YOUR HUCKLEBERRY ! "
bjuice is offline  
Old 06-05-2007, 02:15 PM
  #10  
zano
Member
JUNIOR BUILDER
Thread Starter
 
Join Date: Feb 2006
Posts: 72
Default compression

it sounds like nobody really knows and your right i think this is what i got. i do know its a merlin III block victor heads ported intake i hope the rest is right. i should have the car back together in a month or less i'll let you know


over and out zane
zano is offline  

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service