it may be a future project, but got my next stage underway with a set of Dymags, Programmable cdi, and removing unwanted weight. Roll on 1st March for the start of the season :D :D :D

The theortical relationship between speed and pressure on a forward facing ramir setup is:


It hardly looks like it would be worth the effort but at the risk of copping a beating IMHO it would be harder to design a worse pickup than the NC30/35 has, a restrictive pickup located behind the radiator and above the engine.

IMHO the gains of a decent ramair system would not so much be from the ram effect but from getting a unrestricted flow of cooler air into the airbox.


regards
jon

Jon wrote:The theortical relationship between speed and pressure on a forward facing ramir setup is:

It hardly looks like it would be worth the effort but at the risk of copping a beating IMHO it would be harder to design a worse pickup than the NC30/35 has, a restrictive pickup located behind the radiator and above the engine.
IMHO the gains of a decent ramair system would not so much be from the ram effect but from getting a unrestricted flow of cooler air into the airbox.
regards
jon

i agree with what your saying jon,it's not the best design on the bikes and maybe there are little benefits from the ram air system but surely every little helps,also every V4 400 worth it's salt over here racing has some form of hole cut in the front or like aly's a huge duct under the nose to help feed the carb cool fresh air.
but i like the kits rick does and once i score myself a set of rvf carbs at a sensible price i'll consider rick '35 HRC kit if it's available
it coupled with a tuned motor would be a missile on track and with a fettled road motor i could be pretty good fun on the road
now where to get an HRC air box lid at a sensible price ....

Sorry I didn't mean to say it wasn't worth doing, I am definitely going ahead with mine and believe it will be defintely worth the effort.
Just saying that I dont feel the "ram" contirbution to the whole gain will not be great.

When I was still trying to get my NC30 reasonably sound the lid I now wan't was always on eBay, the guy who was selling them must have got sick of it and now I cant find one so I will try and make the snout and fit it to my airbox (I want to run a filter).



regards
jon

i remember seeing those ages ago myself and now they are gone,same as the HRC box lid,i saw a few of those about and again ,gone.

i look forward to seeing what your doing as i'm interested to hear about the results

good luck

I have one of those Airboxes, brand new in Carbon Kevlar, not cheap but if anyone wants one drop me a mail.
mail@abrmoto.co.uk

Also go a HRC copy one but no snout, or have a snout but is smashed, could be fixed or copied.

abrmoto wrote:Also go a HRC copy one but no snout, or have a snout but is smashed, could be fixed or copied.

could you fire me over some pictures aly please

could anyone advise a bit more on emulsion tubes.
I have a problem with the mid on my bike.We have a main jet in that gives us the best peak power, have found a needle that has boosted the power....but can not get this rich mid out. from 6k to 10k to rich.
if i was to block one of the holes in the emulsion tube, would this theoretically lean that area up?

From Dellorto's manual, who have a pretty good handle on tuning slide type carburettors;

"The atomisers fitted to Carburettors intended for four-stroke engines are manufactured with different types of side drillings because the positions of these holes affect acceleration response.
Atomiser holes positioned high up cause a weakening in the mixture since they are above the float chamber fuel level and only let air in; conversely,holes lower down cause mixture enrichment because they are below the chamber fuel level and draw fuel from the well to the barrel.
The result is that, to weaken the mixture under acceleration, atomisers with holes drilled higher up are required, while to enrich the
mixture, atomisers with holes lower down are needed. The holes' diameter determines how long the well takes to empty and it is
therefore also necessary to select a suitable size."

Atomisers = Emulsion tube

If it is running rich in the 6 to 10k range I would have thought you were still looking for a needle that is thicker in the tip or dropping it down a notch.


regards
jon

Soz, bit of thread raping, but what differance do the hrc springs have over standard ones?