overheating and feul inj.
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Cruiser
Joined: Sep 2005
Posts: 137
Likes: 0
From: NY
overheating and feul inj.
In september of 05 i had an issue with overheating and blew the engine on my 1997 eg classic,i had it redone , alot more performance upgrades. the builder had said that it is not uncommon to overheat with feul injection.the life span of an engine is reduced by the injection. with this he says it's not all systems it is the early ones and reccomends i go to carb, even if he gets not $ and i do it myself.he claims that the old system is not as good as the new and the computer controls the timing and i was about to purchase a sert and true duals .he says do research on this site , get feedback before i do either.so what do you think?
Road Warrior
Joined: Jan 2006
Posts: 1,797
Likes: 1,187
RE: overheating and feul inj.
Well, that's a theory anyway, but I'd have to disagree. It sounds like maybe he's talking about the heat management features on the newer Delphi systems versus the older MM systems. It's true that the newer EFI models have them, but it's also true that they need them more. Due to EPA compromises, the newer engines tend to run leaner, and thus hotter, than than the earlier ones. For that reason they have features that richen the mix and "skip a spark" when engine temps reach a certain level. Even with those systems, however, I would venture that the newer engines tend to run hotter than the earlier ones. Neither the MM nor the Delphi system tend to run hotter than the other. The increased engine temps in newer models are a function of other elements (see EPA, above) that tend to make the engine run hotter. Changing an MM EFI system to a carb is not going to do one thing to make the engine run cooler. There may be other reasons to make the change (I don't agree with them, but some people just like carbs), but engine temps and longevity are not among them. A PCIII or a SERT are perfectly capable of making changes to the A/F mix or the ignition timing in order to accomodate any build.
Uncle Peepers
Uncle Peepers
Road Warrior
Joined: Jul 2005
Posts: 1,751
Likes: 1
From: USA
RE: overheating and feul inj.
Adding on to what Uncle Peepers said... The Harley's newest EFI system has a 3-stage heat management system (idle control, fuel mixture, timing). If anything, this will give you an extra level of protection over a non-EFI system. But yes, thanks to EPA bureaucracy, our tourers are running hotter and quite frankly, I don't see that much emissions benefit over older models. Just as with my '04 Dyna, when I go into my garage a few hours after a ride, my garage has that same typical Harley "exhaust" smell.
Ahhhh... I LOVE that smell.
Ahhhh... I LOVE that smell.
Intermediate
Joined: Jul 2005
Posts: 45
Likes: 1
From: Stockton, CA
RE: overheating and feul inj.
I also had a problem with overheating. I blew the head gasket on my RK and the tech said it was partly due to my bike running lean. The previuos owner changed out the pipes and never got a SERT or power commander. I like the response from fuel injection compared to the carb on my 91 Heritage, but many of my friends prefer carb.
Road Master
Joined: Mar 2006
Posts: 791
Likes: 0
From: Arizona
RE: overheating and feul inj.
ORIGINAL: HDManny
I also had a problem with overheating. I blew the head gasket on my RK and the tech said it was partly due to my bike running lean. The previuos owner changed out the pipes and never got a SERT or power commander. I like the response from fuel injection compared to the carb on my 91 Heritage, but many of my friends prefer carb.
I also had a problem with overheating. I blew the head gasket on my RK and the tech said it was partly due to my bike running lean. The previuos owner changed out the pipes and never got a SERT or power commander. I like the response from fuel injection compared to the carb on my 91 Heritage, but many of my friends prefer carb.
I always advise those who change their pipes, also need to upgrade to at least a Stage I air filter and get their bike dyno tuned! Unless you're doing it as a set, you'll run into problems down the road. The HD Stage I download is a waste of money. It's just another way for the dealer to make money! Get either a PCIII or SERT, and dyno tuned! You'll also see a great increase in horsepower and torque (at all throttle levels.)
Banned
Joined: Nov 2005
Posts: 3,499
Likes: 2
From: CANADA
RE: overheating and feul inj.
I ride quite a bit in the cold, bike fires up instantly, and warms up to idle speed quickly. EFI/Dyno tune is the way to go. Your bike will run and perform at its full potential. The difference can be very dramatic!
Road Warrior
Joined: Jul 2005
Posts: 1,751
Likes: 1
From: USA
RE: overheating and feul inj.
I think people who like the carb are those who really don't understand about fuel injection system. Yes, it's complex, but the benefits are great, especially if you travel up in high altitude and cold weather. It's always nice to just hit the start button and have your bike warm up without pulling the choke, and not start choking when climbing a mountain!
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Road Warrior
Joined: Jan 2006
Posts: 1,797
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RE: overheating and feul inj.
You should also mention that you can "re-jet" the bike without even getting your hands dirty
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Uncle Peepers
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Road Master
Joined: Aug 2005
Posts: 851
Likes: 1
RE: overheating and feul inj.
I have an 03 Heritage, my buddy has an 03 standard. We went riding last year and parked in front of the HD dealership and when we shut them off and got off the bikes, mine started ticking alot, (as it usuall does) like it was cooling off and his did nothing. I wonder if thats just the clamps for the heat shield on the exhaust thats making the noise? I dont know.