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1915cc installed, lack of power feels like clutch slip
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72SilverBullet
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PostPosted: Fri May 27, 2016 5:31 am    Post subject: 1915cc installed, lack of power feels like clutch slip Reply with quote

Hello everyone, got my 1915 in my dune buggy and it ran decent enough for a test drive last night. I took it out and I feel like it lacks some power. It feels quicker than my 1600 but not by much. One issue that is noticeable is if I floor it in 2nd 3rd or 4th while doing 30, 40 or 50 is that it revs up quickly but doesn't move any faster. It feels like the clutch is not holding which could be possible but I get no burnt clutch smell and from start I don't feel slip. Off the line acceleration is decent but not great. I expected way more. Not sure what it could be, maybe timing or lack of fuel? I still need to time the engine and play around with carbs but it's just weird issue I didn't think I'd come across. Engine specs below, thanks.

94mm pistons
Dual Weber 44s
W-120 cam
Stock rockers, solid shafts
40/35.5 heads
4 into 1 header
Stock clutch
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Mikedrevguy
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PostPosted: Fri May 27, 2016 6:07 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

When you say it revs quick, how quick, how high?
Where are you shifting?

Stripped axle stub?
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72SilverBullet
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PostPosted: Fri May 27, 2016 6:32 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

I don't think its an axle nut, car ran and drove prior to motor swap and it was fine. It is also a new lightened flywheel.

As far as RPM go, if im going steady at 2200-2500 RPM and then floor it, it will increase speed (not at a rate that is anything to write home about) but then at like around 4000 RPM it goes to like slip feel mode where you actually have to back off the throttle because you feel like your just burning up the clutch and wasting gas. I understand that the cam may make peak power at higher RPM but at roll I don't see it tearing through the clutch. Maybe a compression check is next?
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tzepesh
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PostPosted: Fri May 27, 2016 6:35 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

Did you re-adjust the clutch cable to the new motor?
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PostPosted: Fri May 27, 2016 6:37 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

If it feels like a clutch and it sounds like a clutch.... Razz
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72SilverBullet
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PostPosted: Fri May 27, 2016 7:01 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

tzepesh wrote:
Did you re-adjust the clutch cable to the new motor?


That I did not, the clutch was off the old motor and maybe had 2K miles on it. It looked perfect so I threw it on the new flywheel. Its just weird how it has no odor at all if its slipping and how from a start feels fine. I guess that's whats throwing me off. Perhaps a clutch order would be in the works next, any recommendations?
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Singerdude
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PostPosted: Fri May 27, 2016 7:09 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

Mine did something very similar and it turned out to be the cam and lifters getting chewed away. Check valve lash to make sure it is not that...
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72SilverBullet
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PostPosted: Fri May 27, 2016 7:17 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

Singerdude wrote:
Mine did something very similar and it turned out to be the cam and lifters getting chewed away. Check valve lash to make sure it is not that...


It was a new cam and I did break it in according to instruction. I actually adjusted the valves again just this morning to see if they were out of adjustment and only a few were at .007" so I brought it down to .006". I also didn't see any metal in the oil when adjusting valves.

Does anyone know what valve float feels like? Im curious if its related to that.
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PostPosted: Fri May 27, 2016 7:56 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

sounds like it's just driving through the clutch. change it befor you burn up the flyingwheel. stage 1 pp&good disc, or a duel friction disc may work with stock pp, but is it worth trying that just to find it needs pp too?
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PostPosted: Fri May 27, 2016 9:25 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

porkchop-rob wrote:
If it feels like a clutch and it sounds like a clutch.... Razz



"Quack, quack !!!"

Engine revving up and VW not moving faster correspondingly would be clutch slippage or axle nut splines as noted previously.
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PostPosted: Fri May 27, 2016 10:15 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

Mine did the same thing, when I put in my 1835. It's your clutch, I would almost bet on it.
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PostPosted: Fri May 27, 2016 10:26 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

It sounds very like it is the clutch, but it might have oil on it too which might let it slip and stay cooler Smile

Mine decided to let go at around 65mph when there was enough gearbox oil on it to slip. The driveshaft seal was worn and hard and oil seeped out. The seal was not helped by the vibration from when the previous engine should have died but did not when a rocker slid off the rocker arm. The backfiring shook everything up because I was overtaking a truck at the time and had to hold on for about half a mile to pull in.
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PostPosted: Fri May 27, 2016 11:11 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

Experimental Wet Clutch disk test in progress?


Reminds me of the Burnout contest at Kelly Park. He let out the clutch and floored it, everyone cheering him on.... and thought the smoke that followed slowely later was his tires. Then the cheering sounds stopped, someone informed him that the whole time neither one of his tires was spinning.
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72SilverBullet
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PostPosted: Fri May 27, 2016 12:01 pm    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

Im looking into a Kennedy Stage 1 clutch kit. Whats better Daiken or Kush kit? Stage 1 should be enough clamping power right at 1700lbs?
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rs58rag
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PostPosted: Fri May 27, 2016 12:32 pm    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

Everything looked good on your build specs till i read stock clutch.
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72SilverBullet
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PostPosted: Sat May 28, 2016 3:58 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

rs58rag wrote:
Everything looked good on your build specs till i read stock clutch.


Hahaha, figured if I'd stay away from launches I'd be fine. I have other vehicles designated for that.
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PostPosted: Sat May 28, 2016 7:56 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

I learned on my first build(1874cc) that the stock pp & new disc wasent enough. I learned with my 2332 the kenady stage 1&new disc wasent enough.(works fine on my 2028). you have to remember that the gearatios in the trans gets the car moving & reduction keeps the clutch fealing like its enough...untill the engine power/torque over comes the gear reduction&holding power of the clutch. there's when you get slip in high gears and not somuch if any lower gears. hell way back when...(early 90's) I bought a new 4wd.after some work(better breathing intake,syn oil& a few other mods) it would drive through the stock clutch in higher gears.some on these vehicles the clutch is just barly enough to hold the avaliable power. kinda hard to sell a new vehicle to the masses with a race clutch in it....and no need for it 90% of the tyme.
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72SilverBullet
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PostPosted: Sat May 28, 2016 10:07 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

Thanks for the input everyone, I adjusted the clutch cable and found that it got better but is still slipping. Il be ordering a Kennedy pretty soon. Would a stage 2 be overkill? And worse drive ability?
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PostPosted: Sat May 28, 2016 10:51 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

yes it's over kill.
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PostPosted: Thu Jul 07, 2016 5:58 am    Post subject: Re: 1915cc installed, lack of power feels like clutch slip Reply with quote

Installed the Kennedy Stage 1 rigid disc, no more slip, rejetted carb moves a lot better now. Thanks for the help everyone.
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