Has anyone got some experience with the JK single quiet pack? I rebuilt my engine a couple of years ago. 1800 with mildly ported 1800 heads. It has also got a Web cam 73 and the whole lot has been balanced. It is still running the stock Solex carbs but I have jetted them to suit. This pushes around a 1974 fully loaded camper. I'm always surprised as it goes much harder than I would expect it to for such a small motor and the weight it is pushing around. It will easily sit on 70 mph for ages but I do notice the cylinder head temps getting a bit high if the weather is a bit warm. Anyway, I'm due for a new exhaust and I also have a set of Dellorto 36's waiting to be bolted on. I was wondering if a system like the JK stainless quiet pack would flow better than a stock set up. I would hate to restrict the engine especially after I fit the dellorto's. Would the quiet pack be better from a performance standpoint? Hopefully a freer flowing exhaust might drop the cylinder temps a bit. Any advice would be appreciated. Cheers Mark
Its also less restrictive than EMPI rusty versions. Improves performance but you lose putt-putt and get vroom because all exhaust tubes are the same length... .It is loud but the transmission noise and the roofrack are louder at 70 on my bus..
Yea I bought one recently , and sold it on as I just didn't like the sound from it , back to a new empi now , I don't care if it rusts I'll buy another
Thanks for the replies. The sound could be an issue for me as I do some pretty long trips. I''m not that concerned with rust either so the Empi might be another option as well. I read somewhere on another thread that the Empi has smaller pipes than the JK but hopefully it would still flow pretty well.
Wingnut, is your engine a Type 1 or Type 4? Not sure if there would be much difference in sound between the 2
The rate I was getting through EMPI exhausts on my bus I had to get a stainless exhaust as it was cheaper. Unless you strip the delivery paint and properly paint your EMPI from fresh it will go rusty in 1000 miles, and bits start flaking after about 6 months / 6000 miles..
I think you’d be disappointed with an EMPI exhaust regardless of how quickly it rusts. I had one on my 2.0 for a few years but it is restrictive with considerably smaller pipes than the heat exchangers. I have a CSP Python now but you could buy quite a few EMPI exhausts for the same price. Just out of interest what is the cylinder head temp at 70 mph?
had my empi about 3 years, painted it new and repainted last winter, the welds are weak point and had to reweld where centre fits. when I buy next one will make some brackets to hold each silencer section, on plus side lasted longer than kwik fit exhaust on other car.
Thanks for the help everyone. Apart from some extra noise, I think the Stainless exhaust might be my best bet. 77 Westy, I've got a Dakota Digital cylinder temp gauge on my camper. At 70 mph, it reads around 405 degrees farenheit on a warmish day (if ambient temp is around 35 degrees celcius). Mine is a fully loaded camper with a roof rack. We are usually travelling a fair distance when we go in the camper so we are carrying lots of camping gear. So the motor is pushing a fair amount of weight. I have got Toyo H08 195 r14 tyres on my camper. Because of the higher profile, my speedo probably reads slightly slower than it would with normal tyres. I think would be minimal thou. The other thing is that I live in Australia so our temps get pretty warm and with the long open roads, I can drive at 70mph for extended periods of time which allows the heat to slowly build up in the heads. Cheers
I've just taken delivery of one of these exhausts and hope to fit it up tomorrow, so I'll let you know what I think of it once its all done, but on first inspection from the box its a decent looking system.
Personally your restricted by the Heat exchangers ....they have a sharp angle straight out the head and they are a small diameter ..so unless changing these as well the exhaust is irrelevant ....i like like the vintage speed exhausts
Ive got this but for the type 4 engine and it's been great. they do go a funny shiney brown/gold colour quite quickly though... I'm not that fussed as long as it doesn't rust in a year. fairly loud but not irritating
The best you can do with heat exchangers still fitted is make sure the exhaust inner diameter is the same or larger than the exchanger. The JK has larger tubes while the EMPI tubes are the same diameter as the heat exchanger. And the JK flanges are mild steel so they do rust.
I can't really comment re performance but I fitted and jk stainless single pack to my standard 1978 2 litre a couple of months ago ( replacing a rapidly-rusting empi twin pack). Very impressed with quality and fit. Looks a load better too! Sent from my GT-I9505 using Tapatalk
