I thought I would put up a chart for general compression gains. These gain are listed in %, and these are general guidelines. Notice the diminishing returns as compression ratio goes up. You can build a big power engine without high compression, but you will normally see more power up until combustion chamber shape or fuel quality becomes a problem :thumbs:
(http://i233.photobucket.com/albums/ee157/kennybasham/Compressiongains-1.jpg)
what about TQ?
Damn, I need to get up to 16:1, that 15:1 isn't cutting it at all.
See what I'm sayin'? :nod:
Quote from: troywcc on December 12, 2009, 05:23:43 PM
Damn, I need to get up to 16:1, that 15:1 isn't cutting it at all.
:lol: :lol:
15:1 is for girlz troy :lol:
I don't know why that made me think of that joke preddy, what has two thumbs and loves blowjobs? THIS GUY!!!
Quote from: troywcc on December 15, 2009, 11:05:56 AM
I don't know why that made me think of that joke preddy, what has two thumbs and loves blowjobs? THIS GUY!!!
You can't see it but I typed that with two thumbs up, pointing to myself. :rofl:
what about making this sticky? :thumbs:
it will good if u could add the gas octane number in the chart, sir
About all that can be said about octane ratings are general guidelines each builder finds through experience on specific builds at his particular altitude. We normally find that a 12:1 Raptor motor will do just fine with a WEB 290 (4) on pump gas. Change that cam out for the RJ and you may find you'll need to do a mild mix in high temps with a hot motor......... A spark plug heat range change, a piston a piston with tighter squish, combustion chamber shape and seasonal fuel blending etc..... The Raptor motor will normally run at about 175° if you are riding at a fairly fast pace with plenty of airflow through the radiator, if you do a lot of slow technical riding the fan won't cut on till about 220°. That can make a huge difference. We have had motors that wanted to use race/pump blend at sea level with 11.5:1 at the same time we have specially built pump gas engines to over 13.7:1 on pump gas at sea level. It is just to broad to define. Even the age of your gas can change this....... :thumbs:
Quote from: Kenny on January 07, 2010, 12:09:39 PM
About all that can be said about octane ratings are general guidelines each builder finds through experience on specific builds at his particular altitude. We normally find that a 12:1 Raptor motor will do just fine with a WEB 290 (4) on pump gas. Change that cam out for the RJ and you may find you'll need to do a mild mix in high temps with a hot motor......... A spark plug heat range change, a piston a piston with tighter squish, combustion chamber shape and seasonal fuel blending etc..... The Raptor motor will normally run at about 175° if you are riding at a fairly fast pace with plenty of airflow through the radiator, if you do a lot of slow technical riding the fan won't cut on till about 220°. That can make a huge difference. We have had motors that wanted to use race/pump blend at sea level with 11.5:1 at the same time we have specially built pump gas engines to over 13.7:1 on pump gas at sea level. It is just to broad to define. Even the age of your gas can change this....... :thumbs:
ANSWER YOUR PHONE
Yeah! Answer your phone lol.
YES ANSWER YOU PHONE!! :P I need a TB bored form a YFZR