Turbo or supercharged 2Ts?

[TZ350]

Is there room for say 80cc H2O - 100cc air cooled Turbo and/or Supercharged two strokes in F4?

I am interested because I like the development side of buckets, previously we have had MX85's proposed.

So I am just floating the idea to get other peoples opinions about whether there is a place for expanding the rules to allow a broader range of options, particularly options that encourage experimentation.

[F5 Dave]

Only if that 80cc is an MX engine.

I think 65cc is the most I'd be asking for with parity to the 1.5 current rule which in itself - as other turbo classes show is too loose anyway.
example:
Lets get Rich or a Scott FXR engine, destroke it, Turbo cams & compression, whap the boost up to a silly level & 40hp or your money back.

[TZ350]

I think 65cc is the most I'd be asking for with parity to the 1.5 current rule which in itself - as other turbo classes show is too loose anyway.

Yes, I have no idea what is a fair thing myself, would that be 65cc water cooled?

Lets get Rich or a Scott FXR engine, destroke it, Turbo cams & compression, whap the boost up to a silly level & 40hp or your money back.

F4 100cc 4T's are allowed turbo and or Supercharging now and FXR's are good candidates as they are already liquid cooled, supercharging (supercharging for drive out of corners) would be the next logical step for Team GPR.

[F5 Dave]

FXRs are not LC, but CBRs are.

I think the rules is too loose but it was never much threat of someone doing it .

I think turbos get written out of rules in many sports as you can turn the boost up more than you could imagine when rules written.

[TZ350]

FXRs are not LC, but CBRs are.

Yes, not water cooled like a CBR, I thought FXR150's have the "Suzuki Advanced Cooling System (SACS)" making the engine liquid cooled with oil being squirted up under the piston and around the top of the head and then pumped out to a radiator.

FXR150 New Zealand 2002 Specifications

ENGINE Type: Four-stroke single, Oil-cooled, DOHC, TSCC Bore: 62,0 mm (2441 in.) Stroke: 48,8 mm (1.921 in.) Displacement: 147 cc (8.99 cu. in.) Lubrication: Wet sump

[Bert]

F4 100cc 4T's are allowed turbo and or Supercharging now and FXR's are good candidates as they are already liquid cooled, supercharging (supercharging for drive out of corners) would be the next logical step for Team GPR.

It has been discussed in great length. Standard big end likely wouldn't handle it.... Not that a solution couldn't be solved for that issue..
And maybe not a full FXR but maybe it's little brother 125....

Yes, not water cooled like a CBR, I thought FXR150's have the "Suzuki Advanced Cooling System (SACS)" making the engine liquid cooled with oil being squirted up under the piston and around the top of the head and then pumped out to a radiator.

FXR150 New Zealand 2002 Specifications

ENGINE Type: Four-stroke single, Oil-cooled, DOHC, TSCC Bore: 62,0 mm (2441 in.) Stroke: 48,8 mm (1.921 in.) Displacement: 147 cc (8.99 cu. in.) Lubrication: Wet sump

Now, this posed an interesting question, what do the rules actually say.... Sweet FA, in fact the engine specifications have been dumbed down significantly and detailed specs moved to appendix D (as we all already know). But reads a lot loose'er than previously.... No Consideration around turbos in appendix D nor any real specs around water cooling (other than Air cooled requirements for 2t for 125cc)... Hard to say if a 100 turbo would actually be legit for a GP...

[husaberg]

FXRs are not LC, but CBRs are.

I think the rules is too loose but it was never much threat of someone doing it .

I think turbos get written out of rules in many sports as you can turn the boost up more than you could imagine when rules written.

Yes, not water cooled like a CBR, I thought FXR150's have the "Suzuki Advanced Cooling System (SACS)" making the engine liquid cooled with oil being squirted up under the piston and around the top of the head and then pumped out to a radiator.

FXR150 New Zealand 2002 Specifications

ENGINE Type: Four-stroke single, Oil-cooled, DOHC, TSCC Bore: 62,0 mm (2441 in.) Stroke: 48,8 mm (1.921 in.) Displacement: 147 cc (8.99 cu. in.) Lubrication: Wet sump

The wording in the rules is either air cooled or conversely, no restriction to on make type design (of cooling). (as per the class rules)
Fxr150's are not air cooled.........

[TZ350]

No Consideration around turbos in appendix D nor any real specs around water cooling (other than Air cooled requirements for 2t for 125cc)... Hard to say if a 100 turbo would actually be legit for a GP...

I am happy to think supercharging is a generic term covering both turbo and traditional supercharging, but like you say its not exactly the way the rules are written.

Agreed the rules are lagging behind about aftermarket EFI's, and Turbos, but personally I would not have any trouble with someone else running a 100cc Turbo 4T.

But a Turbo or Supercharged 2T is definitely not allowed in the rules at present, but could there be room for them? the only point I guess would be added technical variety for those that enjoy that sort of thing.

I think anyone who could get a Turbo EFI 2T working well enough to race would deserve a medal in their own right but it could be worth allowing for the learning experiences that would come out of it.

[mr bucketracer]

The wording in the rules is either air cooled or conversely, no restriction to on make type design (of cooling). (as per the class rules)
Fxr150's are not air cooled.........

hate to know how long it would last if a blanked the top end off from air (-;

[husaberg]

hate to know how long it would last if a blanked the top end off from air (-;

One could say the same about the radiator on a liquid cooled bike

[Grumph]

The wording in the rules is either air cooled or conversely, no restriction to on make type design (of cooling). (as per the class rules)
Fxr150's are not air cooled.........

Well.....sorry but another branch of motorsport - speedway - has already set the precedent by accepting the air/oil cooled GSXR's as air cooled motors...And as we all come under the MSA in NZ, I'd see that as a binding precedent.

[husaberg]

Well.....sorry but another branch of motorsport - speedway - has already set the precedent by accepting the air/oil cooled GSXR's as air cooled motors...And as we all come under the MSA in NZ, I'd see that as a binding precedent.

Nah your aguement doesn't hold water you are in over your head.

Ps that's f-ing sweedway.....not even........its a bloody car rule an all..........
So its not a branch is a different tree.........

[Grumph]

Nah your aguement doesn't hold water you are in over your head.

This from someone who lives where the annual rainfall exceeded 14 METERS !!

[husaberg]

This from someone who lives where the annual rainfall exceeded 14 METERS !!

I didn't come down in the last shower though Noah.......

[TZ350]

4T's have a chance to play with forced induction, so in the interests of fairness and a level playing field, what about the 2T's why should they be forced to suffer the humiliation and prejudice of Strokerisim ...



2T's are more and more often coming in for the blower treatment.