Rev Limiters

[OveFundinFan]

I understand that there was a cost rise going from 2 valve to 4 valves engines, that was the start of really higher costs. Two inlet and two exhaust tracts to work on for better flow performance. If there was exciting racing then, why go to the complexity of todays rocket ships, plus 2 valves would be easier for the new entrants to the sport to ride as well.

All last year, and previous years, there has been some discontent on this forum in respect of cost and performance of todays rockets. I have no doubt will hear the same thing on this forum during 2019 as well. 

[adonis]

On 1/22/2019 at 3:32 PM, f-s-p said:

What do they do? 

JImmy mac is a machine examiner ,  making sure people are using round wheels and not square ,tatum ex rider  gives his expertise as to how difficult square wheels can be on tight turns

 

[adonis]

21 hours ago, OveFundinFan said:

but you still have a machine which is virtually the only machine on the world market, that newcomers to the sport have to handle and maintain. If speedway was just as exciting on machines of the 70's, and the engines of a modern day 2 valve would be cheaper to purchase, maintain and easier to ride, then why not do a u turn, or is that not allowed.

i'm afraid  it's too late to turn back the clocks now , modern metalurgy and machining capability  would mean  ,not much effort to make a 2 valve just a revvy and fast , and just as expensive in parts to keep servicing

[f-s-p]

4 hours ago, adonis said:

JImmy mac is a machine examiner ,  making sure people are using round wheels and not square ,tatum ex rider  gives his expertise as to how difficult square wheels can be on tight turns

 

So nothing I couldnt do

[mac101]

ashtechs video with a few tip how to look after your engine including his say on the rev limiter 

[PHILIPRISING]

3 hours ago, mac101 said:

ashtechs video with a few tip how to look after your engine including his say on the rev limiter 

INTERESTING even for technical morons like me... thanks Ash

[Bald Bloke]

Some good stuff there. Thanks.

[GWC]

Engine development in the Motor industry has been encouraged (forced) to produce smaller and more efficient engines that go just, if not faster than before.

Surely the majority of UK tracks (Belle Vue apart) do not need such high powered engines.

Reducing the cost of engine maintenance should be the priority if the sport is to continue as it is in the UK.

 

 

[Sings4Speedway]

2 hours ago, GWC said:

Engine development in the Motor industry has been encouraged (forced) to produce smaller and more efficient engines that go just, if not faster than before.

Surely the majority of UK tracks (Belle Vue apart) do not need such high powered engines.

Reducing the cost of engine maintenance should be the priority if the sport is to continue as it is in the UK.

 

 

Taking the early part of this comment, some of the "best" / closest racing i have seen regularly features 250cc speedway machines, the lack of power actually enables the riders to take a few more liberties and are forced to look for additional grip from the track. Given the nature of UK tracks these could be a much more practical solution however they wouldn't resolve the  cost reduction element.

[f-s-p]

A good video yes. Radio controlled car industry is full of vids like that, just that with a 100+ manufacturers they all have a commercial agenda. Basically what Ash just said is what he wrote 2 years ago.

[Daniel Smith]

9 hours ago, f-s-p said:

A good video yes. Radio controlled car industry is full of vids like that, just that with a 100+ manufacturers they all have a commercial agenda. Basically what Ash just said is what he wrote 2 years ago.

How would Ash's video benefit him? He has said rev limiters would cut rider's costs. Unless you have evidence to say he'll get more work because they'll be more damaging to engine's (which they won't be).

[uk_martin]

I wonder if the rev limiter could ever become a "smart" rev limiter, hooked up to a transponder whereby like in Formula E the fans can vote in extra revs for a rider of their choice for certain (safe-ish) parts of the track?

[Gambo]

1 hour ago, uk_martin said:

I wonder if the rev limiter could ever become a "smart" rev limiter, hooked up to a transponder whereby like in Formula E the fans can vote in extra revs for a rider of their choice for certain (safe-ish) parts of the track?

The considered opinion is that Rev Limiters only have any effect at the start.

Back in my days as a 17 year old owner of a Triumph Tiger Cub, we had a rev limiter! Only it was just called a throttle in those days! 

[IronScorpion]

Nowadays, they are using electronics & programmes to use in motor sport for the perfect start.

[Vince]

On ‎2‎/‎9‎/‎2019 at 10:33 AM, Gambo said:

The considered opinion is that Rev Limiters only have any effect at the start.

Back in my days as a 17 year old owner of a Triumph Tiger Cub, we had a rev limiter! Only it was just called a throttle in those days! 

 

Tiger Cubs had a big end that would disintegrate within a few seconds as a secondary rev limiter though

[GWC]

I lost track of speedway just at the time when Weslake and Jawa were the dominate engine and then came back to the sport when the lay down invasion had started.

Did Weslake just give up down at Rye or was it their commercial decision not to compete?

Whilst lay downs have made the sport quicker and maybe more spectacular the safety of the riders isn’t and the knock on effect has been the introduction of the air fence and loss of racing lines.

Its just as well that medical technology has kept aspace!

[Rob Dyer]

With this innovation due to come in for 2020, be interesting to see if the forthcoming AGM discusses implications and makes public comment.

[Sings4Speedway]

Also is the 4 years of silencer homogenisation not up so there could be potential new models added to the usable list?

[*JJ]

Riders just go for the cheapest one! We had a Prodrive silencer at one time; this was much better quality than the most common type, but cost twice as much so noone bought them! Before you ask, they were selling them off cheap as remaindered stock.

[jenga]

i think it was VW that had a form of rev limiter built into the early rotor arms of their ignition system . when the centrifugal force  spun the rotor arm past a certain RPM  , a small spring would open up and cut out the electrical circuit  to the dizzy cap and the revs simply stopped .  dont think they have anything like that nowadays . its all ecu,s and other things .. but as they say on here , the moment you back the throttle off , as speedway bike speeds up ! 

jeez , is that the time ?