GRiSO ghetto
Would you like to react to this message? Create an account in a few clicks or log in to continue.


12425 - Established June, 2013 - all GRiSO, all the time...
 
HomeLatest imagesRegisterLog in
 

 Throttle Respons/Power Loss After Adjusting Valves

Go down 
+4
Bill Hagan
beetle
Papa Lazarou
creid123
8 posters
AuthorMessage
creid123
Carlotto
Carlotto
creid123


Posts : 28
Join date : 2017-07-26

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Fri Sep 08, 2017 6:24 pm

So after this past weekend, i adjusted the valves to spec 0.10 IN and 0.15 EX. After driving it around town, the sound of the bike has a less "tractor" like sound to it and the bike feels spotty and gutless in the lower revs/low throttle position. On top of this, it feels like the bike doesn't have that torque-y "oomph" when i yank back on the throttle. Could i have adjusted the valves too tight? Maybe i need to do a fuel re-map to match the valve adjustment?

Also, i replaced the air filter with a BMC filter, changed the oil to 20w50 full synthetic, and put in NGK iridium plugs. Might that have something to do with it?

Still trying to learn the nuances to this bike!


Thanks!
Back to top Go down
Papa Lazarou
GRiSO Capo
GRiSO Capo
Papa Lazarou


Posts : 826
Join date : 2014-10-07
Age : 68

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Fri Sep 08, 2017 8:20 pm

As it's the last thing you did, check the clearances again. Your guess is probably right.
Back to top Go down
beetle
GRiSO Capo
GRiSO Capo
beetle


Posts : 9537
Join date : 2013-09-30

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Fri Sep 08, 2017 8:40 pm

Put a stock air filter back in. The aftermarket filters are little more than rock strainers. The stock filter flows more than the 8V requires.

.
Back to top Go down
https://www.griso.org
Bill Hagan
GRiSO Capo
GRiSO Capo
Bill Hagan


Posts : 1644
Join date : 2014-07-03

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Fri Sep 08, 2017 11:50 pm


While, of course, it likely has no effect whatever on the (odd) symptoms you report, why 20w50 vice the recommended 10W60?

Good luck on sorting out the power-loss issue.

Bill
Back to top Go down
Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper


Posts : 9468
Join date : 2013-05-29
Age : 65

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Fri Sep 08, 2017 11:58 pm

The aftermarket filter will of buggered up the breathing, it will take a few hours for it to try and trim around the incorrect parameters introduced by the filter.

My own personal preference would be that anybody who suggests puting a rock strainer air filter on any modern engine should be tarred and feathered and then towed through the streets in a tumbrill before being stuck in the stocks and pelted with rotten fruit and human waste until they give their customers their money back and promise never to do it again.

Second offence means they are locked in a room and forced to listen to Celine Dion records for ten years which is effectively a death sentence!

Look, I've said it a thousand times. The stock filter flows more than enough air for the motor and also takes crap out. BMC's and K & N's and their ilk are labyrinth filters that don't work very well. The idea there is some advantage to them because they are washable is a joke! Over here a stock air filter costs about twenty bucks. A K & N costs multiples of that! You'd likely have to do 100,000Km plus before it became a sensible economic proposition in filters alone and once you throw in the cost of valves, guides and barrels and Pistons because you've dusted your engine by not getting the crap out of the air it starts to look like a seriously crap idea!

Believe us or don't but Mark and I can assure you, unequivocally, that you won't get one iota more performance out of your 8V by using a labyrinth filter. My Stelvio had one in. It was the first thing that got thrown in the bin after it was rollerised. I'd rather spray my privates with lighter fluid and start stringing matches than have one in one of my bikes!

Pete

PS. There are no 'Nuances'. It's a machine. It obeys the laws of physics and engineering.
Back to top Go down
Steak
L'Innominato
L'Innominato
Steak


Posts : 3154
Join date : 2013-05-28
Age : 57

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Sat Sep 09, 2017 5:02 am

Another vote to ditch the BMC. Also, there is no reason to run 20W50 other than that's what you can find at the parts store. 10W60 full synthetic is the factory spec and is readily available online and will ship straight to your doorstep. I've found competitive pricing for MOTUL at [You must be registered and logged in to see this link.] and even on Amazon.

--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
[You must be registered and logged in to see this image.]

2012 MOTO GUZZI GRiSO 1200SE

2013 MOTO GUZZI STELVIO 1200NTX - Orange Blossom Special
Back to top Go down
https://www.grisoghetto.com
creid123
Carlotto
Carlotto
creid123


Posts : 28
Join date : 2017-07-26

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Sat Sep 09, 2017 10:35 am

Thanks for all the input everyone! Upon the recommendation, i took the BMC filter out and put the old paper filter back in. Noticeable difference on the throttle response for sure. Wow, what a piece of shit (more eloquently put by Pete). Check that off the list. Next step is determining if the valves may be a little too tight and maybe a fuel re-mapping as suggested by Beetle.

Bill, my mechanic recommended 20w50, but i may go back to 10w60 per the manufacturers suggestion.
Back to top Go down
Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper


Posts : 9468
Join date : 2013-05-29
Age : 65

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Sat Sep 09, 2017 11:02 am

Your mechanic does know that the oil is also used as a dedicated coolant and is supplied through a separate pump through a separate circuit to cooling galleries around the exhaust valve seats? The oil gets flash-heated to some pretty extreme temperatures, that's why the specification is slightly more critical with the 8V. The oil also gets squirted onto the undersides of the piston crowns for cooling purposes but that comes from the high pressure lubrication circuit.

The 8V motor is not like your grandpa's V7 Ambo.

Pete
Back to top Go down
creid123
Carlotto
Carlotto
creid123


Posts : 28
Join date : 2017-07-26

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Sat Sep 09, 2017 3:59 pm

So Pete, you're saying I should switch back to 10w60?
Back to top Go down
Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper


Posts : 9468
Join date : 2013-05-29
Age : 65

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Sat Sep 09, 2017 4:15 pm

Yes, at the next change interval. No point in worrying unduly and if there are problems with the viscosity choice they will likely be cumulative rather than being instantly catastrophic.

Having said that there are probably reasons why a10/60 is specified so why not use it? It's not hard to get a full ester synth 10/60 on line and unless you've had some sort of catastrophe oil isn't something you need at incredibly short notice so just plan ahead a bit. Same with service items like filters and gaskets. Buy a set and keep them one the shelf. If you sell the bike you can always gift them to the next owner.

Pete
Back to top Go down
pokeyjoe
Don Abbondio
Don Abbondio
pokeyjoe


Posts : 127
Join date : 2014-08-21

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Sat Sep 09, 2017 4:19 pm

10w-60 is becoming pretty easy to find in local stores. As it turns out, BMW (automobiles) is now specifying that weight in M3s and stuff.
Back to top Go down
2highlander
Biondino
Biondino
2highlander


Posts : 244
Join date : 2016-09-28
Age : 62

Throttle Respons/Power Loss After Adjusting Valves Empty
PostSubject: Re: Throttle Respons/Power Loss After Adjusting Valves   Throttle Respons/Power Loss After Adjusting Valves Icon_minitime1Mon Sep 11, 2017 12:46 am

But the oil choice does not cause the power loss I think. Maybe the valve clearances have been set somewhere else than in the compression stroke of the appropriate cylinder?
Back to top Go down
 
Throttle Respons/Power Loss After Adjusting Valves
Back to top 
Page 1 of 1
 Similar topics
-
» adjusting valves
» Fuel mixture lean? Power loss?
» Another high speed/rpm power loss - stumble
» High speed, low throttle stumble/power dip
» Adjusting slow idle

Permissions in this forum:You cannot reply to topics in this forum
GRiSO ghetto :: The Ghetto :: GRiSOLOGY-
Jump to: