2LikesGo-Tech Engines Thread
12-09-2010 | 12:33 PM
Joined: Dec 2009
Posts: 7,916
From: northern michigan
the general formula for power loss with increases in altitude is 3% every 1000 ft above sea level if you race in colorado at 5000 ft instead of california at sea level you can expect to loose 15% power output out of your engine if the engine is tuned proper, running at higher altitude requires a leaner mixture setting than running at sea level, tune accordingly for good performance.
12-09-2010 | 12:35 PM
I have a question for you guys.... Does anyone in here run these GO engines at an altitude of 5,000 feet or above? I am curious what your doing to get power out of them as I have seen several GO's run up here and one was in the hands of a team driver from Texas, and I have not seen the power you all are speaking of with these mills.
Are people pulling out headshims on engines at sea level at all?
Are people pulling out headshims on engines at sea level at all?
12-09-2010 | 12:38 PM
Joined: Dec 2009
Posts: 7,916
From: northern michigan
12-09-2010 | 12:39 PM
I have a question for you guys.... Does anyone in here run these GO engines at an altitude of 5,000 feet or above? I am curious what your doing to get power out of them as I have seen several GO's run up here and one was in the hands of a team driver from Texas, and I have not seen the power you all are speaking of with these mills.
Are people pulling out headshims on engines at sea level at all?
Are people pulling out headshims on engines at sea level at all?
also remove the carb restrictor as this will be starving you motor of o2 which is a lot thinner at 5000 feet.
the more o2 into the carby the more power u will have. JMO
12-09-2010 | 12:40 PM
12-09-2010 | 12:42 PM
Joined: Dec 2009
Posts: 7,916
From: northern michigan
12-09-2010 | 12:46 PM
Tech Master
Joined: Nov 2009
Posts: 1,192
From: Colorado
Sorry but ALL engines are different, you can't tell me that every engine runs the same deck height, the same compression, and the same heat of glow plug. All of those actually make a difference on engines at altitude. You can be the best tuner in the world and if your way over shimmed at altitude your gona run hot, have no power, and chase a tune all day. There were a good number of pro drivers this year that really struggled with their engines at Nationals here and the altitude at that track is 6,500 feet. It's not like any of those pros are bad tuners, so it's not as easy as just tuning it to make good power.
I was asking because I was hoping someone in here has actually been running a GO engine at altitude, and has tested different things. I mean it could be as simple as running 40-50% nitro or it could be pulling a head shim, running a cooler plug and going to 20%.
12-09-2010 | 12:49 PM
Joined: Dec 2009
Posts: 7,916
From: northern michigan
Sorry but ALL engines are different, you can't tell me that every engine runs the same deck height, the same compression, and the same heat of glow plug. All of those actually make a difference on engines at altitude. You can be the best tuner in the world and if your way over shimmed at altitude your gona run hot, have no power, and chase a tune all day. There were a good number of pro drivers this year that really struggled with their engines at Nationals here and the altitude at that track is 6,500 feet. It's not like any of those pros are bad tuners, so it's not as easy as just tuning it to make good power.
I was asking because I was hoping someone in here has actually been running a GO engine at altitude, and has tested different things. I mean it could be as simple as running 40-50% nitro or it could be pulling a head shim, running a cooler plug and going to 20%.
I was asking because I was hoping someone in here has actually been running a GO engine at altitude, and has tested different things. I mean it could be as simple as running 40-50% nitro or it could be pulling a head shim, running a cooler plug and going to 20%.
, try all 4 and let us know what you come up with....LOL
12-09-2010 | 12:54 PM
12-09-2010 | 12:57 PM
12-09-2010 | 01:08 PM
....i am a MACHINIST, and i run C.N.C MILLS and LATHE'S...so i am just wondering...thanks neal
12-09-2010 | 01:14 PM
so if you turn down the head button by lets just say .2mm....you would have to remove .2mm of shim to get the same trapped compression ratio...right?....im sorry neal..im not arguing..just very interested....i am a MACHINIST, and i run C.N.C MILLS and LATHE'S...so i am just wondering...thanks neal
....i am a MACHINIST, and i run C.N.C MILLS and LATHE'S...so i am just wondering...thanks neal
12-09-2010 | 01:15 PM
Tech Fanatic
Joined: Aug 2008
Posts: 891
From: Texas
alternatively, you can go to 40% nitro and use all three shims. The increase in nitro more than compensates for loss in Oxygen content and ambient air pressure. If you're still having trouble, performance-wise, remove one copper and add an aluminum shim (2 alum, 1 copper).
12-09-2010 | 01:18 PM
Tech Fanatic
Joined: Aug 2008
Posts: 891
From: Texas