vagabonddreamer

i am converting my 83 cc to CTD it is going to tow heavy loads...i would like to prep for a future exhaust brake if i can ever affoard it...my question...i am about to order a gsk kit...i have heard that if you install an exhaust brake you need heavier valve springs...if that is true...i might as well go with the 4000 gsk and install the heavier springs from the beginning??? if i DONT need heavier springs for an exhaust brake...then i will stay with the 3200 gsk and stock springs....thx..vs

redstreak

You'll need heavier springs with an exhaust brake. I'm pretty sure that the BD brake comes with 60lb springs and the price isn't to bad either.

flashgordon

seam like every one that has put a 4000 in go back to the 3200
If the ex brake dude come with valve spring they will be for the ex vales only (more then likely!)

So the 4000, will need new valve spring any ways!
With the 3200 spring,... would work with stock spring as long as you don't over rev it witch may be possible out of gear......I do believe the "safe limit' # 3400 RPM!!!

G1625S

As far as valve float under power, the safe limit is roughly 3400, but the back pressure created by the exhaust brake can pick the exhaust valve off the seat at much lower rpm...hence the need for updated springs regardless of governor spring choice. I would recommend 60lb springs on intake and exhaust. Use the 3200 rpm spring. It'll pull hard all the way up to 3200, and the 12v head is done being efficient well before that anyway

vagabonddreamer

so you are saying...to go with the heavier springs...but stay with the 3200 gsk...makes sense if you arent gaining anything past 3200 anyway...thx..vs

G1625S

Yup If you're in there messing with the exhaust springs anyway, you might as well do the intakes too---the when you do wind it to the moon by accident (the 3200 will free rev much higher than 3200...) you'l have piece of mind, rather than pieces of engine The 12v is really quite happy working around 2200-2400. That's the range it was designed around (for the most part) and that's where you'll see the best power/economy/longevity, IMO. The 3200 spring will simply allow you to wind 'er up when you want to keep speed on a long grade...or smack the occasional Honda when you're trailer's not loaded

hippie

Check out the US Gear Ex-brake. It fits in the Ex-pipe, 4" pipe only. It has a waste-gate on it for the earley trucks, and one for newer trucks.