Date: Tue, 07 Jun 2005 13:41:03 GMT From: "Dexter J" <lamealameadingdongnospamlamelame.org> Subject: Re: Turbos?
Salutations: On Tue, 07 Jun 2005 02:08:13 GMT, James Sweet <jamessweetnospamail.com> wrote: > >> I've been looking around for a Rajay that might be retro-fitted to my >> 403 >> Olds in the motorhome. All I want is a couple of extra foot-pds of >> torque >> for the hills and I'll bet it is exactly the ticket if I can find one. >> > > You'd probably be just as well off with a Garrett T4 or similar medium > sized > turbo, any number of exhaust or performance shops can fab the parts you'd > need to install it, but you have to be careful boosting engines that were > not designed for it, and you pretty much have to be fuel injected for it > to > work well. Well that's what I'm reading up on lately. I'm running a 1977 403 inch Olds block with the truck cam. It was sort of a cross platform solution for GM - being used in everything from generators to firebirds to motor homes. The idea was to use a universal engine across as many platforms as possible (sound familiar anyone?). The primary difference between engine application being the cam, carbs and timing module. It was used as a replacement for both the 455 and 350 in many applications. So - where I am not looking for 600+hp out of the engine, but rather a bump of 100 or so foot/pds of torque around 3/4 redline (2,800 rpm), I think the stock compression and intake is fine. The engine was vastly under-compressed to make smog numbers. The problem is finding the original plumbing kit several folks made for the 403 engine back 25 years ago. The Rajay had the advantage of using a completely standalone spring set waste gate (no vac) and only needed an oil line off the cooler nipples. There are several intercooler options out there, mostly from GMC diesel division. The Rajay used a insert above the carb to pressurize the system and, I think, could be bolted directly onto the stock exhaust manifolds. BAE also seemed to have a similar solution. In either case, you need two turbos' with a cross pipe to make it work evenly. Effectively, what I'm trying to do is add some punch - but nowhere near the limit of the turbo or the engine given that there is pretty much no occasion where I'm much above 3/4 redline being that it is a motor home. Garret and AR type solutions like our SAAB units are *much* more powerful, but therefore more complicated, than I actually need I think. However - I could well be dead wrong and so continue with the reading. The stock figures for the engine as it sits now are: 185hpnospam RPM, 320ft/lbs torque nospam RPM. I'd like to see Return to Main Index
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