Competition I let the clutch out at 3800rpm.......

[jimk]

camshaft

I have been wonting to know but nobody that I have read about has asked so I will try, the camshaft that is stock and the marine and the custom grind, can any one tell me the lift, duration at 0 and . 050 and lobe centers. The effect of increased duration on a diesel engine. The lift I would think would be limited valve to piston clearance, not like a non turbo engine where the flow will stall at a given lift in for a specfic port and valve size.

Thanks for any info JImk















TE]Originally posted by Sled Puller

Its in the cam man!



It is awesome from 1800 to 3000, but you still have useable power clear to 4200, where my gov. is set.



It runs very smooth up that high. [/QUOTE]

 

[Strick-9]

Jim,



I don't think cam profiles are something anyone wants to give out. You'll have a hard time convincing anyone to tell you how moving the valve events around will affect spoolup/driveability/performance.



I've got the lobe profiles for my stock 160 HP cam and I haven't extracted the marine cam profiles yet.



I wanted to do some driveability comparisions between the two cams then look at the specs. The is a LOT of room for improvement on the intake side of things on both of the cams that I've seen.



-Chris

 

[JBrookshire]

WHAT DO YOU CALL STOCK????

You cry :{ about the gassers being to big how about the guys with little or no mods on ther CTD??? They should put you guys with pockets with no bottom in a different class. [super stock] Just think the other way around and look at it from a guy with a mild or stock CTD. Yea,, Why even try??????

 

[Mark_Kendrick]

I can tell you that the ATS(Denver) cam has a LOT more lift and a LOT more intake duration.



The Idea is that the cylinder has a little more time to recieve the air charge.



Lobe separation is the same as stock. Diesels generally don't like valve overlap. Overlap reduces cylinder pressure at low rpm and causes them not to run. . sorta like a lopy gasser won't idle at 550-800rpm like a stocker.



Telling much more would divulge a few things I promised not to.



I can say that you will not get more lift than the ATS cam w/o hitting the pistons or at least dangerously reducing clearance.



It's pretty routy

 

[CUMINNTSTRKN]

Originally posted by Mark_Kendrick

I can tell you that the ATS(Denver) cam has a LOT more lift and I can say that you will not get more lift than the ATS cam w/o hitting the pistons or at least dangerously reducing clearance.



It's pretty routy

yeh i heard it had a little to much lift. i hope you guys get it figured out before muncie. are you going to sled pull or drag race?



jim

 

[jimk]

camshaft

Thanks Mark, I have seen where two camshaft that were the same except that one has a faster ramp limited to the size of the lifter on flat tapet, that is the reason reason a dodge engine can have a faster ramp than a chevy on a camshaft, that would make more power. The reason I like to see the duration a . 050 . If the camshaft has a quik ramp like the camshaft the Hughes engine make for a dodge then the engine might make more power. I have seen camshafts that were ploted and after you look at the spect. then it is easer to understand what is going on. Dont get me wrong I have no intention of making or having a camshaft made I am only interisting in learning. thanks again JImk

 

[HVAC]

Keepin' Yur Boots On

I hear all about all the spring loaded clamps and "T" clamps, but I've broken or blown just about everything out there. It doesn't look as cool, but I double hose clamp the problematic connections. When you do, reverse the second clamp. This works for me anyway. I feel I get more clamping force this way.



Another trick from the motorcycle riders (I'm a retired harley racer/rider) is to use some hair spray on the metal and then slide the hose over it. The hair spray sets up and is like glue.

 

[Mark_Kendrick]

jimk

The stock cam looks sharp compared to this one. . it's REALLY round!



Fuller,

I'll be racing. I'll sled pull if anyone that lives near me brings a trailer. I plan to have my wife with me and have to catch a plane Monday. I don't want her stranded if I pull a Kondolay and break something:-laf



I may sled pull but it's doubtful.

 

[Mark_Kendrick]

HVAC,



I'll have to try the hairspray thing. . sounds like a good idea.



That speed shop you mentioned had 2 weber fittings. . thanks!!!



I'll have to get you a cold beer next time I'm over.



Later,

Mark



P. S. Are yo gonna make the RamRunners meeting this month? it's down a little SW of San Jose.

 

[Sled Puller]

Re: WHAT DO YOU CALL STOCK????

Originally posted by JBrookshire

You cry :{ about the gassers being to big how about the guys with little or no mods on ther CTD??? They should put you guys with pockets with no bottom in a different class. [super stock] Just think the other way around and look at it from a guy with a mild or stock CTD. Yea,, Why even try??????

heheheh!!



It was not a stock class, it was a MODIFIED street class.

Must have plates and insurance.



Headers straight out the hood are frowned on by the State Highway patrol, AND insurance companys!





www.enterpriseengine.com can answer most of the cam questions, but will not give out specs, I'm sure.

 

[MCummings]

Ohh, Gonna have to do that hairpsray trick and double clamp before I head up to Muncie.



Wouldn't a cam with some overlap give a very smooth idle? I am *thinking* well, atleast have a thought,, that if cylinder pressures are reduced at idle the slowing down and speeding up of the pistons would be less and the motor would turn over easier (Just get a turbo that spools up quick and you should be okay)



Am I off on a limb here?



Then, with Injctors that have a lower pop-off pressure than stock the idle could smooth out even more.



What yall think?



Thanks,

Merrick Cummings Jr

 

[Mark_Kendrick]

lowering the pressure at idle makes for a diesel that doesn't run well at idle and won't start easily or at all.



Low pop-off injectors seem like they'd tend to dribble. the high presse it to keep them sealed when not injecting and ensure that when they open they spray a well atomized charge.



Later,

Mark

 

[MCummings]

Thanks, Cool about the low compression at idle. I was un-sure.

You could use some Ether to help a no start low compression motor (Like My Dad's Detroit 6-71)



Where's Don M ? He knows alot about pop-off pressures and how they effect idle, and High RPM EGT.



I've heard that HUGE injectors that have Low Pop-Off pressures can really smooth and quiet down the idle of a 24V. Reason being that the injection period starts sooner and finishes later, greatly reducing the Cylinder pressure "Spike" that causes the "Diesel" Sound.



Merrick Cummings Jr

 

[Big_DQ]

Gene, sounds like that engine is ready for some serious pulling. Don't limit it to such low RPM's though. Crank those springs down and let it really run

Don

 

[Sled Puller]

I saw you pics Don,

were my stages of emotion.



Me thinks you are the man to beat at Muncie, I may have to do a tire change, ad drugs, run more gear, more rpm, etc,etc ect to stay close. :{ :{ :{

 

[TxDieselKid]

Don,

One quick question from your web site, in the "Coming" about the engine, what is "Aquahol injection"? You mean Alcohol?



Plus, why do some heavy duty pullers have those boxes on the front of their truck? Yours is green in case you don't know what I mean.



Andrew

 

[Big_DQ]

Gene,have you ever heard the term "all show and no go"? At this point the TOY is sitting in the shop minus; One transmission, One transfer case, One injection pump, One turbo and One rear-end. Don't be too worried about Muncie



Andrew those boxes on the front of those trucks are to cover those ugly weights. They also make a nice place to put stickers

Don

 

[Big_DQ]

The Aquahol injection is SUPER TOP SECRET :eek

I could tell you what it is, but then I'd have to force you to buy and drive a powerstroke

Don

 

[Johnboy3]

HEY!

Easy on the Powerstroke stuff! lol

 

[HVAC]

OUCH! Heheheee