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Old 09-20-2013, 03:14 PM   #1
Iranian OP
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Evo engine vs Twin cam

Hi,

How good or bad is the Twin cam compared to the evo engine?
Is fare more reliable then the evo engine?

I have testdriven lots of twin cam engines but no evo engined bike.


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Iranian
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Old 09-20-2013, 03:23 PM   #2
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The TwinCam has several serious issues but makes more power. The Evo is a rock solid engine short on power.
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Old 09-20-2013, 03:34 PM   #3
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the evo motor is a reliable motor. Probably the first in Harley's history.

Twinkies seem to have some issues, heat is one of them hence the piss-heads coming out now, but I don't know enough guys with twinkies to give any real stats.
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Old 09-20-2013, 03:44 PM   #4
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According to this guy....

http://www.jamesrussellpublishing.bi...buyharley.html
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Old 09-21-2013, 07:12 AM   #5
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Terrible writing, and full of shit. I don't dispute that the TC has some issues (particularly the earlier versions), but the author of that page is just full of it.
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Old 09-21-2013, 11:46 AM   #6
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We have both, an 89 FLHS & a 2000 Road King. I like 'em both. The TC makes more power & the whole bike is more modern, of course. I changed the cam chain tensioners at about 40K. They were OK but who knew. The EVO runs cooler & get better fuel mileage but it just feels like it's working to cruise 85, where the TC is just loafing along. IMO, Just get the bike you like, either motor is fine.

Good Luck, Murf
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Old 09-21-2013, 12:00 PM   #7
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Hey! Where's Jerry?
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Old 09-21-2013, 01:37 PM   #8
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In the past month or so I have replaced 5 sets of cam chain tensioners. From 15 to 70 thousand miles. They were all first generation. I've done two sets of second generation this summer. I can do the job in 3 hours now I've done so many.
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Old 09-21-2013, 02:22 PM   #9
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Hey! Where's Jerry?
It's about time someone asked this question. IMO, the EVO is a far superior motor. Not that they have not made a few improvements with the TC, but using 2 cams and a chain drive is not one of them. Neither is using a pressed together non serviceable crank. The Twin Cam was designed to make factory assembly easier (and of course cheaper) at the cost of most of it being disposable rather than rebuildable. And then there is that heat issue. So if the only thing gained was power, the TC is a total fail. The EVO had plenty for what it went into. A cruiser. Harley copied a lot of Japanese design and manufacturing techniques with the TC, and that is one place they had been way ahead of the Japanese with the EVO.
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Old 09-21-2013, 02:59 PM   #10
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Twin cams are better than evos. Only real issue with TC are the early cam chain tensioners. They just need to be checked every 10-20K miles (many bikes want valve adjustments at lower mileages). Later ones ('07 up) are better. TCs do have crank problems when ya start building them over 100hp but few EVOs ever came near 100hp. EVOs had just as many camcase problems as TCs. My '09 103TC is putting out 99hp/109tq with pretty much only pipes/AC/cams and is way better than any of my EVOs that blew up.
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Old 09-21-2013, 03:57 PM   #11
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It's about time someone asked this question. IMO, the EVO is a far superior motor. Not that they have not made a few improvements with the TC, but using 2 cams and a chain drive is not one of them. Neither is using a pressed together non serviceable crank. The Twin Cam was designed to make factory assembly easier (and of course cheaper) at the cost of most of it being disposable rather than rebuildable. And then there is that heat issue. So if the only thing gained was power, the TC is a total fail. The EVO had plenty for what it went into. A cruiser. Harley copied a lot of Japanese design and manufacturing techniques with the TC, and that is one place they had been way ahead of the Japanese with the EVO.
Have you ever owned a Harley?
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Old 09-21-2013, 04:24 PM   #12
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Have you ever owned a Harley?
He has owned and experienced everything, but only on the internet.
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Old 09-21-2013, 04:33 PM   #13
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Have you ever owned a Harley?
No, but he is thinking about getting one as soon as he saves up the money.
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Old 09-21-2013, 06:41 PM   #14
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Considering my evo has torn up something and the cam is now screaming and my lifter screen is full of metal shavings, and the previous owner rounded off one of my exhaust bolts so I can't get it off easily.. I may be a little biased, but I will try to give you MY opinion on it. Keep in mind all of my problems are coming from a previous owner screw up, so, it's not the bikes fault.

Evo's, in my opinion, are the better engine if you aren't trying to build them up to be high horse power engines... they were designed to plug along at low RPM's with just enough horse power and torque to get the job done, and that is how they should stay. The good thing about the evolution motor, is that they have the Timken bearing; something Harley has not put in the twin cam since 2002. Nothing worse than having your non-rebuildable flywheel coming out of true in your post 2002 twin cam because you had no timken bearing... Evo's have gear driven cams, which can be a blessing if something does go south in the cam chest because they're relatively easy to work on. Keep in mind that you can put timken bearings on a twin cam flywheel and you CAN go to gear driven cams. You simply ship your bottom end out and the mechanic/shop will install races into your cases and the bearings on the crank pin, and you can have them true your flywheel and weld it up nice and strong if you'd like which is the best way to go. The only major problem I can tell with the evolution motor is the fact that lifters need replacement every 40,000 miles, but that is an EASY job to do... and the crappy stock INA cam bearing that needs to be swapped out with a torrington which is also an easy job to do. Evo's will eventually develop a base gasket leak, but proper warming up of the motorcycle will keep this from happening for a LONG time.

Right now I'm looking at a little over 2k to fix my bike. I haven't gotten inside the came chest yet, but I figure if I'm going into it I might as well replace the rockers, pushrods, swap out the lifters, and put in an Andrews EV27 cam, and put a Torrington inner cam bearing in. I'm just hoping there aren't a whole lot of metal shavings in the engine. A crane singlefire ignition is on the list, along with a honing of the jugs and a re-ring, and head work... valve seats and all that. After all of this the bike should take me to 150k with no problems as long as I keep up on the periodic maintenance. I love this old evo but she sure has been a head ache.
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Old 09-21-2013, 07:01 PM   #15
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Originally Posted by anotherguy View Post
In the past month or so I have replaced 5 sets of cam chain tensioners. From 15 to 70 thousand miles. They were all first generation. I've done two sets of second generation this summer. I can do the job in 3 hours now I've done so many.

Great! Have you lowered your quoted hours to reflect the time savings?


I bought my FXDL with 52K on the clock. The tensioners were gone by then and had to be replaced.
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