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Post by bezzer on Feb 6, 2018 18:57:03 GMT 1
Anyone using/tried these carb slide inserts?, manufacturer claims an extra 1.5 - 2 BHP per 100cc on 2 stroke engines?. Not a bad return on your investment if the claim is true?.
Thoughts please 😁……
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Post by muttsnuts on Feb 6, 2018 20:45:50 GMT 1
you buy them, bring your bike as is and we will run it without, then fit them and run with them fitted on the dyno and then you will know ! but to answer your question, no I've certainly not
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Post by bezzer on Feb 6, 2018 21:10:11 GMT 1
Haha, I was hoping for more conclusive proof than that Dave!, be interesting to do a back to back comparison on a ‘healthy’ engine though.
They advise pilot jet size is reduced by at least 50%, in some cases more, so the difference must be pretty dramatic.
Thanks mate, bezzer
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Post by 0h5h1t on Feb 6, 2018 21:21:04 GMT 1
Seen these on Norbo site.. £75 a pair. If you get the full 2bhp per 100cc then it equates to 7bhp giving you 1bhp per £10 spent. In the tuning world that's cheap!
Maybe Norbo could send you some for testing Dave. Would certainly be interesting to see the results.
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Post by bezzer on Feb 6, 2018 21:40:54 GMT 1
Seen these on Norbo site.. £75 a pair. If you get the full 2bhp per 100cc then it equates to 7bhp giving you 1bhp per £10 spent. In the tuning world that's cheap! Maybe Norbo could send you some for testing Dave. Would certainly be interesting to see the results. Exactly my point, a good return on your investment 😁
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Post by bezzer on Feb 6, 2018 21:54:07 GMT 1
If the claims are true 🤔
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Post by Tobyjugs on Feb 6, 2018 23:05:55 GMT 1
Just read this and thought smaller pilot jet means less fuel, less fuel means less power. Unless its going to run leaner which will give you more whizz until something breaks. Seriously though i am intrigued to see what these do
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Post by JonW on Feb 6, 2018 23:09:25 GMT 1
Id love to see the results of these too. The logic says that with the same main (and a smaller pilot) that they wont add power...
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Post by bezzer on Feb 7, 2018 5:07:10 GMT 1
UFO Website states : **When installing UFOs, the pilot jet must be reduced substantially (usually about 50%, sometimes even more). Most installations end up with a 3.5 UFO and a #17.5 or #20 pilot jet.
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Post by jon on Feb 7, 2018 6:43:58 GMT 1
The power curve of a motor is over its entire rev range.
Where is the extra power added, and for how long?
I gaurentee it’s not over the whole rev range, even if it does at some point which IMO is highly unlikely at the amount suggested. 7HP on an 350LC is maybe 18% or more!
With all the complexities of an engine to produce a certain amount of power such as its ability to draw in maximum fuel and air (at the right ratio), let as little escape into the expansion, compress it and ignite it at the right time, I can’t see how these are going to improve things significantly.
Dyno results are the only way to prove or disprove this.
Jon
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Post by Tobyjugs on Feb 7, 2018 6:55:08 GMT 1
I suppose if the intake velocity is higher with less turbulence due to cleaning up the bottom of the slide, more fuel will be drawn from the carb bowl.
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Post by Norbo on Feb 7, 2018 9:32:29 GMT 1
What i can tell you 1 customer did get back to me with feed back and he was very impresed with them and said it made a remarkable improvement to the running of the bike and would recommend them to any one. he is on hear so may be if he reads this he will chip in himself if he come on .
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Post by jackjabba on Feb 7, 2018 17:18:22 GMT 1
They increase the airflow of the carb when fitted by up to around 15%. Most people who have fitted them say the throttle response is noticeable. American snowmobiler did some testing on various carbs with and without them fitted and got some good data.
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Post by muttsnuts on Feb 7, 2018 17:30:31 GMT 1
I'll be happy to test them, just need some to be sent to me as I am not spending anymore money testing stuff, I totted it all up and over the last 8+yrs I've spent in the region of £8k on parts and after my recent clear out I recouped around haklf of that, so testing has cost me £4k, of course that doesn't take into account my time, dyno time/costs etc Somebody buy a set, bring your bike and we will do a before and after, if they work, Norbo can give me 15% commission for helping sell sh*te loads for him once the results are posted
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Post by Norbo on Feb 7, 2018 18:02:34 GMT 1
L OL Im happy to send you a set to test thats not a problem but i nether have a bike or the time to do the rest . you'll need to rejet but assume you have an array of piles and mains any way i can send some X blocks as well if its a ypvs you end up testing them on you can see how they compare to a standard set up
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Post by muttsnuts on Feb 7, 2018 18:07:09 GMT 1
ok, we just need a bike now - any volunteers ?
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Post by Norbo on Feb 7, 2018 18:36:44 GMT 1
you have a few dont any of them have big carbs on ?
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Post by Tobyjugs on Feb 7, 2018 18:40:59 GMT 1
L OL Im happy to send you a set to test thats not a problem but i nether have a bike or the time to do the rest . you'll need to rejet but assume you have an array of piles and mains any way i can send some X blocks as well if its a ypvs you end up testing them on you can see how they compare to a standard set up I would love to see your X-blocks tested as they are a similar idea to my modified standard reeds. How far is Mutts from Hull?
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Post by muttsnuts on Feb 7, 2018 18:50:11 GMT 1
I am 40 miles from Hull (depending upon which side of the river you live !) - YO17 9DS
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Post by muttsnuts on Feb 7, 2018 18:51:13 GMT 1
you have a few dont any of them have big carbs on ? yes, too many, but none in a state to run just yet, busy doing upgrades/mods etc, no idea why as I never get chance to ride the damn things !
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Post by Tobyjugs on Feb 7, 2018 18:57:27 GMT 1
I am 40 miles from Hull (depending upon which side of the river you live !) - YO17 9DS That make me 43 miles from your house plus some water in between. Ive got a fresh engine to test (thats if the cylinder head can hack it)
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Post by Norbo on Feb 8, 2018 9:24:35 GMT 1
I do have UFO's for standard 26mm LC/YPVS carbs as well as the big ones if that helps
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Post by reggieperrin on Feb 10, 2018 13:37:09 GMT 1
My N is bog standard with 51 BHP at the back wheel, on the Gibson dyno. Would be tempted but I can't see you'll get much gain with the standard pipes...
Plus, I'm a long bloody way away from dave...!!!
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Post by ozzysbikes on Feb 11, 2018 9:07:34 GMT 1
Did the test get sorted (looks like tobyjugs was going to volunteer ?) if not I am fifty miles away and would be interested in testing the bits on my F2 YPVS, it’s standard tune engine with Micron chambers and the slotted stator back plate, I am very busy until end of March but have a couple of Saturdays free if I move stuff around (can’t make weekdays), also have a zeeltronic that I am hoping to get fitted soon
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Post by Tobyjugs on Feb 11, 2018 13:33:24 GMT 1
Did the test get sorted (looks like tobyjugs was going to volunteer ?) if not I am fifty miles away and would be interested in testing the bits on my F2 YPVS, it’s standard tune engine with Micron chambers and the slotted stator back plate, I am very busy until end of March but have a couple of Saturdays free if I move stuff around (can’t make weekdays), also have a zeeltronic that I am hoping to get fitted soon I was more joking than serious, even though i would like to visit mutts
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Post by bare on Feb 13, 2018 19:17:48 GMT 1
One 'could' cobble up a diy pair of those things from chunks of EPP foam... Rubbery stuff..( it's fuel resistant polyethelene) Carve a pair and stuff 'em in Then try. Likely not as well crafted as the Real inserts but could be good 'nuff to answer the question.
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Post by JonW on Feb 13, 2018 22:16:48 GMT 1
Ive seen people make them from chemical metal.
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horace
Thrash Merchant
Posts: 456
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Post by horace on Feb 22, 2018 22:46:28 GMT 1
I’ve got a stock n2 your welcome to test them on which is easily accessible,
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Post by Tobyjugs on Feb 22, 2018 23:23:12 GMT 1
I am 40 miles from Hull (depending upon which side of the river you live !) - YO17 9DS That make me 43 miles from your house plus some water in between. Ive got a fresh engine to test (thats if the cylinder head can hack it) The cylinder head can't hack it
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Post by muttsnuts on Feb 27, 2018 8:47:18 GMT 1
well I can loan Horace's N2 if Norbo sends me some to fit 28mm stock carbs, happy to test them if I am furnished with the relevant parts and bike, I am flat out at the moment, but will do this if I get the parts and bike as its only an hour to do the testing
Let me know
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