Induction kit

quote:
Originally posted by Panky

As a test I did 100 miles and brimmed the tank again, it took 20 litres which is over 22 mpg. That was on mixed roads including some motorway with a Rapier engine running electric fan, electric water pump, SU conversion, 1 3/4" straight through exhaust and overdrive. The SU carb conversion is running very rich at the moment so I think I could easily top 25 once its sorted, more if I ease off on the right foot:I

th_killin.jpg




Been thinking about the way you have worked this out and you cant do it like that you need to fill it up,drive it till the guage is pretty much empty then work it out.But surpose you need to get it running right first;)
 
quote:
Jon Posted - 14 Jun 2010 : 09:17:33
--------------------------------------------------------------------------------

quote:
--------------------------------------------------------------------------------
Originally posted by Panky

As a test I did 100 miles and brimmed the tank again, it took 20 litres which is over 22 mpg. That was on mixed roads including some motorway with a Rapier engine running electric fan, electric water pump, SU conversion, 1 3/4" straight through exhaust and overdrive. The SU carb conversion is running very rich at the moment so I think I could easily top 25 once its sorted, more if I ease off on the right foot



--------------------------------------------------------------------------------



Been thinking about the way you have worked this out and you cant do it like that you need to fill it up,drive it till the guage is pretty much empty then work it out.But surpose you need to get it running right first


I don't quite understand why Panky's method wouldn't work. Surely the key to working out mpg is to have accurate knowledge of how much fuel is used and how many miles are covered. If you start with a brimmed tank and then fill it to the brim again, you will have as accurate a figure of how much fuel has been used as you are likely to get, regardless of whether you used the whole tank. I would not rely on the gauge as even on the most modern cars it is not an accurate measure of fuel used, it is, as it says on the tin, a gauge, not a measure.

avatar_23306.gif


'I intend to live forever - so far, so good'
 
Don't rely on the speedo based mileage either. If the speedo is way out like Peggy's so will the mileage likely be. Satnav will be more accurate, most have a trip function. This is what I'll do next time I fill Peggy up.

BazRockscropped.jpg

Peggy's been to Snetterton!

If I told you I was a pathological liar, would you believe me?
 
quote:
Originally posted by Jon

All i can say is dont bother all you do is loose power i played about with mine today even mounted it behind front grill at one point sounded great with the induction roar but def slower. Found one thing out though the metal part that fits over the venturi on the carb makes a hell of a difference the one on martins pic is the early type the best one to use is the later type is more oval looking and alot bigger seems to make throttle response smoother and feels more powerfull.I took some pics while i was playin about will put them up when i get chance.;)



Thats why I used an electric fan in the ducting to pull the air through the filter as a long hose (mine is 4 feet as I didnt want to drill the engine cover) will dissipate much or all of the power made up by drawing cold air from the front of the van.
There are pics and fitting details here:
http://66.129.69.181/forum/topic.asp?TOPIC_ID=1382&whichpage=3
Its worth 2.5 horses at 4700rpm according to the rollers

Cheers
Jules

RatSport www.ratsport.co.uk
 
quote:
Originally posted by renaultvation

quote:
Jon Posted - 14 Jun 2010 : 09:17:33
--------------------------------------------------------------------------------

quote:
--------------------------------------------------------------------------------
Originally posted by Panky

As a test I did 100 miles and brimmed the tank again, it took 20 litres which is over 22 mpg. That was on mixed roads including some motorway with a Rapier engine running electric fan, electric water pump, SU conversion, 1 3/4" straight through exhaust and overdrive. The SU carb conversion is running very rich at the moment so I think I could easily top 25 once its sorted, more if I ease off on the right foot



--------------------------------------------------------------------------------



Been thinking about the way you have worked this out and you cant do it like that you need to fill it up,drive it till the guage is pretty much empty then work it out.But surpose you need to get it running right first


I don't quite understand why Panky's method wouldn't work. Surely the key to working out mpg is to have accurate knowledge of how much fuel is used and how many miles are covered. If you start with a brimmed tank and then fill it to the brim again, you will have as accurate a figure of how much fuel has been used as you are likely to get, regardless of whether you used the whole tank. I would not rely on the gauge as even on the most modern cars it is not an accurate measure of fuel used, it is, as it says on the tin, a gauge, not a measure.

avatar_23306.gif


'I intend to live forever - so far, so good'



Because if you use a full tank there will most likely be all types of driving covered and not to the end of the road and back a few times or round the block (urban cycle is the word i think)
 
quote:
Originally posted by commerjules

quote:
Originally posted by Jon

All i can say is dont bother all you do is loose power i played about with mine today even mounted it behind front grill at one point sounded great with the induction roar but def slower. Found one thing out though the metal part that fits over the venturi on the carb makes a hell of a difference the one on martins pic is the early type the best one to use is the later type is more oval looking and alot bigger seems to make throttle response smoother and feels more powerfull.I took some pics while i was playin about will put them up when i get chance.;)



Thats why I used an electric fan in the ducting to pull the air through the filter as a long hose (mine is 4 feet as I didnt want to drill the engine cover) will dissipate much or all of the power made up by drawing cold air from the front of the van.
There are pics and fitting details here:
http://66.129.69.181/forum/topic.asp?TOPIC_ID=1382&whichpage=3
Its worth 2.5 horses at 4700rpm according to the rollers

Cheers
Jules

RatSport www.ratsport.co.uk



Is that 2.5 horses on a holbay or rapier lump?
Sounds good.
What diameter pipe you used jules?:p
 
I need to do the proper maths on the V8 but I think it returns a similar figure to panky - after all it is virtually idling most of the time!

mybanner4a41eb1237a97.jpg
 
quote:
Originally posted by admin

I need to do the proper maths on the V8 but I think it returns a similar figure to panky - after all it is virtually idling most of the time!

mybanner4a41eb1237a97.jpg





Lol thats not bad at all bet i would go down to single figures if you opened it right for a nice long strech lol;)
 
quote:
Originally posted by Jon

quote:
Originally posted by commerjules

quote:
Originally posted by Jon

All i can say is dont bother all you do is loose power i played about with mine today even mounted it behind front grill at one point sounded great with the induction roar but def slower. Found one thing out though the metal part that fits over the venturi on the carb makes a hell of a difference the one on martins pic is the early type the best one to use is the later type is more oval looking and alot bigger seems to make throttle response smoother and feels more powerfull.I took some pics while i was playin about will put them up when i get chance.;)



Thats why I used an electric fan in the ducting to pull the air through the filter as a long hose (mine is 4 feet as I didnt want to drill the engine cover) will dissipate much or all of the power made up by drawing cold air from the front of the van.
There are pics and fitting details here:
http://66.129.69.181/forum/topic.asp?TOPIC_ID=1382&whichpage=3
Its worth 2.5 horses at 4700rpm according to the rollers

Cheers
Jules

RatSport www.ratsport.co.uk



Is that 2.5 horses on a holbay or rapier lump?
Sounds good.
What diameter pipe you used jules?:p


3" pipe
Its a Holbay unit on twin Strombergs

Cheers
Jules

RatSport www.ratsport.co.uk
 
You must log in or register to reply here.
Back
Top