Upgrade Preformance

Sir, I had an upgrade last week for my anniversary Dyna Wide Glide, it is a twin cam engine with screamin' eagle II slip-fit mufflers, parts is:
42mm flatslide carburetor kit. (H.D#29641-99)
Screamin' Eagle 7000 RPM race ignition system for carbureted. (H.D#31713-01)
Screamin' Eagle plug wire kit. (H.D#31930-99)
Screamin' Eagle 204 cam kit. (H.D#25149-00)
Screamin' Eagle high compression forged piston kit. (H.D#22864-00)
Screamin' Eagle Perfect fit pushrod. (H.D#18400-03)
I was looking for a different performance than the stock runs. And I am not satisfied at the job they done to my Harley - the speed will stay on 155 kilometer and it will go no further - (what is gone wrong).. What horsepower and torque we are looking for? Your opinion highly appreciated in this matter
Many thanks
Monther
Kuwait-Chapter

performance issues

Hey man, try a bigger piston and jugs for the increase that you are looking for. My 88 runs pretty good in stock form and likely will not change it because it is a cruiser, not a racer. keep in mind the fact that if you get more power out of your engine, it will decrease its service life due to more pressure on the entire driveline. Also, if you hop it up, you need to get serious about more frequent oil changes, adjustments, and a host of other tuning tricks that you can LEARN to do yourself instead of the high prices paid to tech's for their knowledge and skill. Almost every time you make a change in one area, another is required to get the most out of your first modification such as final drive ratio (gearing). Get a manual, listen to a fast friend, and make only one change at a time, then tune for the change! Good luck!

You didn't go to the big bore when you upgraded pistons? 95" pistons don't cost any more than their 88" counterparts and you can have your cyllinders bored for $100.00. The Twin Cam motor was originally designed to be a 103" motor so when bumped up to 95" they are still overbuilt and you need not worry about the service life. You should fully expect to surpass 100,000 miles with a twin cam....but I would stay on top of replacing the cam chain tensioners or better yet replace with gear drive units...and don't try to build up over 100HP/100lb-ft. The 2003-2004 models had a cheaper, less burly bearing spec'd for the cranks and have been blowing apart when people try to build big HP motors.
Now as far as what you were looking for...I can't believe you are only getting 70mph out of your mods. Maybe my conversion # is wrong but I thought it was 2.2 kilometers to a mile. My father in law has a 88" with screaming eagle heads, 6200 rpm ignition kit, SE 204 cams, and SE slip on pipes. His was dynoed at 95lb/ft of torque and 85 HP...and blows up to 100 mph real fast on a bagger. your mods should perform well for you especially on a lighter bike but something has obviously gone wrong if it won't exceed 70mph. I've read on Harley tech talks forum of several other people who have been dissapointed with the performance builds they have paid for and its been traced back to a wet sumping problem in the crank case. It seems when a cam job is done if the oil pump is not aligned properly and an O-ring gets torn the pump cannot keep up on the scavenge (return) side so an excess of oil stays in the crankcases. This has a negative effect on engine performance because the flywheels are rotating in this "bath" of oil and it causes a lot of drag on the flywheels which slows down the revs and robs power. I'm going to guess that you have this problem as well and if so whoever did your build should be held responsible for fixing it! On Harley tech talk they are advising the people with this problem to find the bolt for draining their crankcases on the bottom of the motor. Open her up and measure the ammount of oil that comes out of the crankcase...it should not exceed 6-8oz. Some people are getting as much as 16oz. and like I said they traced it back to a bad o-ring in the oil pump. Others have gotten that fixed and posted back about how they've found the power they were seeking....Good Luck.

Performance

The performance bottleneck with the twin cam is the stock heads, the S/E heads are good but there are plenty to choose from Direct Parts can help you with specs. Dutch

many thanks for your respond.

Many thanks for your informantion, I shall check this with the local dealership.

this is going to have nothing to do with why he's topping out at 70mph...he has plenty of flow...If he were saying he's topped out at 105mph then I'd say heads may be a factor...but again with screaming eagle heads he should be fine.

155 KPH = 96.3 MPH. actually you may be bottlenecking or the rev limiter may be hitting the peak. It's all about what you want from the bike. I have my Springer for cruising, not racing.

I doubt this scenario as well...As I said my father in law has practically the same setup on his bike, which is a bagger, and it accelerates hard all the way past 100...I've called him and he doesn't even know its top speed cuz he's only run it up to 110mph before he backed off. If its not the problem I covered earlier I'd suspect the carb to be considerably out of tune. The screaming eagle heads perform nicely. If there is a knock against them, some say the valves are too large which can slow down the velocity of the charge hurting the low end torque; but helps wide open top end accelerating. Look somewhere other than the heads.

1. He is not running SE heads right? So, flow will be an issue at high RPM's but not enough to hit the wall at 96 mph.



2. It is not the rev limiter as there ain't no way he is cranking 7k at 95 mph.

3. The combination should net him 80hp / ft lb torque give or take which should put him well over 100 mph easily on that light of a bike.

4. The oil pump o-ring problem is real and could be the cause but that much loss?

5. The high comp pistons, 204 cam should give good power at that RPM also.

A stock EVO FXR with Crane HI4E ignition, EV27 cam and SE slip on muffers (Cycle Shack) will do over 120 mph even with my lard ass so something is not right.

We used to use the rule of thumb of 60 mph = 100 kmh or roughly 2/3 mph to 1 kph
http://www.aer-net.co.uk/edr/kph.htm

So, 155kph = 96 mph and change which is pretty low for his setup.

I would throw it on the Dyno and I'll lay odds tuning is way off like lean...city.

The local dealership not convinced it is an oil matter or close to this issue. However, I am taking the bike for Dyno check today, and I will see through the crankcase and oil pump theory at my own cost. Many thanks,

Sir,
I just had the bike on Dyno jet performance evaluation program, and the result is very surprising.. power (hp) 53.70 and ft-Ibs 70.64 and km/hr is 222.71

Please, any comment on this figures! !

You've obviously got something wrong...the stock horsepower rating is 62 HP for a twin cam. Did you try to drain and measure the oil from the crank case yet? A lot of dealer technicians are going to be leery about saying they might have done something that will cause them to rework on their own dime...you should have had the dyno tech drain the crankcase right after your dyno run...then you would have had the proof for or against our theory right before their eyes.

54 horsepower I'm surprised it got up to 96 MPH.
Something is really worng with that build. Check and see if your throttle is really opening the carb all the way, maybe poor cable adjustment.

Al

There is something very wrong. My recommendation is that you find a good HD mechanic, and not necessarily at the HD shop. My experience with HD shop mechanics is that they tend to be "part changers" and do not know how to trouble-shoot and diagnose.

Sir, Your theory was correct about the oil in the crankcase, it was slightly over 8oz. I shall take the bike for Dyno test next week, but in the main time on road test still have the same difficulty.

Many thanks

Ops, time for a Feuling oil pump and lifters.