TLR intake cams in a TL-S?

[bedford4x4]

I've found some! So I'm keen on buying a set depending on how much the guy wants for them. I see the TLR exhaust cams are the same as the TLS so no point in changing those.

Has anyone else who's done this found the TLR intake cams make much of a difference? They don't have a markedly longer duration but quite a difference in lift.

A guy who used to build classic Pommie racebikes always went with the higher lift rather than longer duration.

I ask because the price/benefit ratio has to be justified.

Also found some TLR bellmouths from the same guy. I'm definitely buying those and will install them when I do the airbox mod.

Thanks

Harry

[Steve TLS]

Re: TLR intake cams in a TL-S?

Sam will know for sure, I think all years TLS & TLR are different. (At first I think it was said only the 97 TLS was different, but I think Sam checked and they're all different (TLS's)).

The TLR cams have a different tooth depth and profile compared to the TLS. So you'd have to change both cams and the idler gear. (To get the rear idler out the engine has to come out or be tilted forward).

So thay don't just drop in.

[cyclecamper]

Re: TLR intake cams in a TL-S?

Some TLSs have different cam gears than some TLRs. The gears look similar, but are not quite compatible in profile. I think late model TLSs and TLRs are the same. Otherwise you just need the correct idler-gear/chain sprocket that matches the cams (and the intake and exhaust cams have to have the same kind of gears.

Its not as good by itself as it sounds. Other people have made the swap and liked it, but to get the most out of it and not lose bottom end power you should bump up the compression a little to match the cams like the TLR does. Otherwise if you keep the TLS pistons putting in hotter cams makes the effective dynamic compression less in your TLS. It changes where the power is made but doesn't really put much more area under the curve; you probably lose power down low. New Wiseco pistons are cheap and pretty good, they have about the same compression as a TLR (though their ads claim more). Or you can find decent used TLR pistons for nearly free (though you'd need new rings too).

Then again, some guys just love the change in the powerband for nearly free just swapping in the cams without taking the engine apart. Could be OK on a low-budget track bike for instance which never sees lower revs.

Some people have pressed the gears off of intake cams and re-timed them pressed back on to work as exhaust cams, with some success. Aparently the stock exhaust cams are set up to reduce emissions, not max power...as are the intakes.

[bedford4x4]

Re: TLR intake cams in a TL-S?

Some TLSs have different cam gears than some TLRs. The gears look similar, but are not quite compatible in profile. I think late model TLSs and TLRs are the same. Otherwise you just need the correct idler-gear/chain sprocket that matches the cams (and the intake and exhaust cams have to have the same kind of gears.

Its not as good by itself as it sounds. Other people have made the swap and liked it, but to get the most out of it and not lose bottom end power you should bump up the compression a little to match the cams like the TLR does. Otherwise if you keep the TLS pistons putting in hotter cams makes the effective dynamic compression less in your TLS. It changes where the power is made but doesn't really put much more area under the curve; you probably lose power down low. New Wiseco pistons are cheap and pretty good, they have about the same compression as a TLR (though their ads claim more). Or you can find decent used TLR pistons for nearly free (though you'd need new rings too).

Then again, some guys just love the change in the powerband for nearly free just swapping in the cams without taking the engine apart. Could be OK on a low-budget track bike for instance which never sees lower revs.

Some people have pressed the gears off of intake cams and re-timed them pressed back on to work as exhaust cams, with some success. Aparently the stock exhaust cams are set up to reduce emissions, not max power...as are the intakes.

Okay. Interesting info here. I like mid range power, so don't want to do anything with detracts from that. Perhaps it would be better to just get the standard cams dialed in properly.

Have a look at the following:

http://www.sv-portal.com/forums/showthread.php?t=23923

Interesting info, although the modified 2001 TLS engine runs out of power earlier, it makes lots more until 8000rpms.

[cyclecamper]

Re: TLR intake cams in a TL-S?

Dialing in the standard cams requires a special fixture and large press...though Sam uses somehting he made and presses it on with his big lathe's feed I think.