stupid question: do CTD's draw vacuum? in Cummins Diesel Forum

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stupid question: do CTD's draw vacuum?

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arrrrrrgh	stupid question: do CTD's draw vacuum?	Lead	[-]
Posts: 8 (12/07/02 11:40:41) Reply Quote More My Recent Posts	Tags : None Remove this ad I have to ask this really stupid question. I am looking to install a boost gauge, and found a nice one but it's only boost, no vac. Most made do both and I am aware that All gas engines draw vac, so this would explain why the majority have both. So how about it all of you with gauges installed, ever draw a vacuum?? thanks
BaddAssDodge	No	#1	[-]
Posts: 347 (12/09/02 21:15:52) Reply Quote More My Recent Posts	There is no need for a vacumm gauge instead install a Exhaust Gas Temp (EGT) gauge. There are several dual gauges that combine these two specifically for the diesels I have the Spa Technique DG-111 Digital great guages but pricy lots of functions and two gauges in one. www.performancediesel.net/SPA_Gauges/spa_gauges.html
BadUnit	Vacuum	#2	[-]
Posts: 863 (12/10/02 05:59:33) Reply Quote More My Recent Posts	Diesels draw vacuum (at least on the turbo inlet side), otherwise they wouldn't suck in air. That's the simple answer. Diesels don't throttle the intake, it is free flowing all the time and the vacuum is relatively low compared to a gas engine, kind of like a gas engine at full throttle. Changes in the vacuum on a diesel can tell you if the air cleaner is dirty (but we already have a pop-up indicator for that). Gas engines throttle the intake and the vacuum they generate because of that is much higher. Fluctuations in the vacuum on a gas engine can tell you things about the engine.
arrrrrrgh	thanks, but	#3	[-]
Posts: 8 (12/14/02 22:02:45) Reply Quote More My Recent Posts	well, thanks for the answers, but I suppose I didn't explane my question completely correctly. I am installing a puro, as soon as I find one I like( too many choices). What I really was asking was is there enough vacuum at the intake manifold that a standard vac/boost gauge( single gauge measures in both directions) is required. The reason I ask this is I know there are boost only guages and have seen one I like, however I know that monitering levels outdside of the gauge's range can damage it (too high a voltage sent to a voltmeter damages the assembly), therefore will I damage the boost only gauge by the amount of vacuum drawn in the intake manifold. incidently, the second reply made me think about it, our engines draw a "vacuum" from the atmosphere( through the air filter as mentioned) but the air then goes to the turbo where it's compressed ( creating boost), then throught the intercooler to the intake manifold. this is why I am thinking about a boost only gauge, it seems to me there will always be boost only as long as the engine is running. thanks
Mopar Mudder	Re: thanks, but	#4	[-]
Posts: 8 (12/26/02 11:40:32) Reply Quote More My Recent Posts	No you just want a Boost gauge and that is all, their are many made for the purpose. The new 2003's don't even draw enough vacuum to operate the exhaust brakes, so an add on vac pump is going to come with them. Mopar_Mudder<BR> <BR> 1983 Dodge W350 4x4, Reg Cab, Long Box<BR> Dana 60's (4.88 gears)<BR> 38.5 Swamper SX's<BR>205 Trans Case<BR> ARB Lockers Front and Back<BR> 440 , .030 over, 10.0:1 <BR> Ported 346 heads, 2.14/1.81 Valves<BR> 285/285 .562/.562 lift solid roller cam<BR> <a href="http://www.mopar.rockcrawler.com">My Home Page

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