[ace.cafe]

 

That ACE sticker on there looks mighty sweet!
 
Thanks for putting that on it.

[Taurim]

 

[Guaire]

Thank you, Taurim!
  Today, another Air Kit 3 including an ACE sticker, will be leaving for Australia!
 Cheers!

[Arschloch]

That ACE sticker on there looks mighty sweet!
 
Thanks for putting that on it.

Too sweet, looks mucj better on a black background. 

[Arschloch]

Excellent Job ! Congratulations !                (   I guess it's the new Seat that  makes the Difference 😁)

That must be it. 

[Taurim]

Some data for discussion after my speed run last week 

As usual, values are the injection time difference in % compared to stock map for WOT at each RPM.



I installed Hitchcocks cams "on the dots", no intake cam retarded.

So my setup is really slower from 2500 to 4250 RPM  And it is really faster from 5000 to 6250 

Do you think this is in line with the job done on my engine, intake and exhaust or is something wrong in my setup ? 

[ace.cafe]

It is expected when installing performance cams.

[Taurim]

It's the same cams in Hitchcocks column and Autotune Column 

The main differences on my engine are :
- head porting (larger intake and exhaust port at 34 mm)
- increased compression ratio from 8.5 to 9.3 + correct distance for squish
- ACE airbox

[ace.cafe]

It's the same cams in Hitchcocks column and Autotune Column 

The main differences on my engine are :
- head porting (larger intake and exhaust port at 34 mm)
- increased compression ratio from 8.5 to 9.3 + correct distance for squish
- ACE airbox

I was just responding to your comment about the bike being slower at lower rpms and faster at higher rpms.

[gizzo]

So my setup is really slower from 2500 to 4250 RPM  And it is really faster from 5000 to 6250 

That's no fun. Faster up high is cool but midrange is nice too. Some in between cams maybe?

[ace.cafe]

That's no fun. Faster up high is cool but midrange is nice too. Some in between cams maybe?

The real answer for that is more compression.
The performance cams close the intake later, so the swept volume after intake close is shorter, so less compression is built. The remedy is higher compression ratio piston.

We tried to recommend the best we could get with the stock piston by doing the squish mod. A flat top would help, or even a few cc's lump.

That's why we used 8cc smaller chamber volume on the Ace head.

All these symptoms have their treatments. They usually cost money.

[gizzo]

The real answer for that is more compression.


All these symptoms have their treatments. They usually cost money.

Yeah. Sigh...

[Taurim]

gizzo if you wan a middle solution, retarding the inlet stock cam gives excellent results and it will only cost you some oil and gaskets 

You can also do the head porting job (not even sure it will add something with the stock cams  )  and shorten the barrel to increase compression ratio and have the correct distance between piston at TDC and the head to have some squish effect.

Plus the excellent Ace airbox if you don't already have it 

With this my 535 was close to 160 kph on the clock (154 GPS)... with the wind in the correct direction  And it kept a good mid range torque.

[gizzo]

gizzo if you wan a middle solution, retarding the inlet stock cam gives excellent results and it will only cost you some oil and gaskets 

You can also do the head porting job (not even sure it will add something with the stock cams  )  and shorten the barrel to increase compression ratio and have the correct distance between piston at TDC and the head to have some squish effect.

Plus the excellent Ace airbox if you don't already have it 

With this my 535 was close to 160 kph on the clock (154 GPS)... with the wind in the correct direction  And it kept a good mid range torque.

Already done all those things  . Each little mod made an incremental improvement. It's actually pretty quick off the mark now and will destroy a stock GT. At the track, I can keep pace with race tuned SR500's, other than on the long back straight where they creep away.
My top speed is about identical to yours, with a tailwind.

[Arschloch]

The real answer for that is more compression.
The performance cams close the intake later, so the swept volume after intake close is shorter, so less compression is built. The remedy is higher compression ratio piston.

We tried to recommend the best we could get with the stock piston by doing the squish mod. A flat top would help, or even a few cc's lump.

That's why we used 8cc smaller chamber volume on the Ace head.

All these symptoms have their treatments. They usually cost money.

I´ve tried a flat top piston with the ACE head and would recommend it for street use only with hessitations because it did affect the idle rather negativelly. I would need to let it idle above 1500rpm to have an stable idle and it would be very temperature sensitive, meaning the idle would rise by 500rpm or so with hot engine. The benefit was marginally better torque in midrange and about 0.2-0.5hp more power output. With the dished stock piston however the engine idles rock stable under all conditions.

It probably will behave differently when the flat top piston is used togeather with the modded stock head.