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Engine - Turbo & Block Modifications and upgrades to maximize your Dodges turbo output & Improving strength and durability - pistons to crank.

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Old 11-30-2012, 10:25 PM   #1
Camshaft Hunting  
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Lookin to get a high performance cam for my 92 daytona 2.5 nonturbo. I found that comp cams sells a hydraulic cam but i believe mines solid and comp cams says that their cam can't be used in anything post 87. Will said camshaft work? And if not, are there any high performance cams out there that improve power (and maybe throw some good sound in there as well)?
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Old 11-30-2012, 10:50 PM   #2
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All factory 2.2/2.5 cams are hydraulic. 88 and newer used roller rockers where the older engines were sliders. If you were to try the Comp cam you would need the slider, or non roller rockers to go with it. The slider cams had larger oil squirter grooves in the cam caps so you would need to enlarge your grooves. Using the old style cam in a newer engine will advance the cam timing a few degrees but that's not a bad thing.

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Lookin to get a high performance cam for my 92 daytona 2.5 nonturbo. I found that comp cams sells a hydraulic cam but i believe mines solid and comp cams says that their cam can't be used in anything post 87. Will said camshaft work? And if not, are there any high performance cams out there that improve power (and maybe throw some good sound in there as well)?
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Old 12-01-2012, 07:15 AM   #3
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I question whether retro-version to slider followers is worth having more cam choices?
I guess if you found an old MP 767 or similar cam for free or cheap...

nobody makes a 'Naturally Aspirated' performance cam for the 88-95 roller 2.2/2.5 SOHC?

anyhoo, the first thing yu need on a TBI car is a free-er flowing exhaust :)

and maybe before, but certainly with, the cam,
you should also swap to PT lifters and conical/3.3 springs;

also CAI, port/polish TB, port match head to manifolds, etc. etc.

and so it begins...
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Old 12-01-2012, 06:25 PM   #4
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It has a free"er" flowing exhaust (1 7/8 pipe, no cat (shh) and in process of getting new performance muffler, also ported head to breathe). But it is possible to transfer from solid to roller? just change the rockers?

i say that, but my interior car guy says "no, stupid, of course theres other stuff"
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Old 12-01-2012, 09:44 PM   #5
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But it is possible to transfer from solid to roller? just change the rockers?

92 would come with roller cam stock.

You should read this to enhance your knowledge.

DDG- N/A cylinder heads

and every page in here

DDG- 2.2/2.5 N/A EFI database
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Old 12-01-2012, 10:45 PM   #6
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Try the F3 cam from FWDperformace. Longer duration and modest lift. Saddly the TBI needs to be bigger, you don't have the CFM for more lift...
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Old 12-02-2012, 06:42 AM   #7
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slight threadjack here, but-

*keeping* the OE TBI system (not swapping to a weber carb.) -
what options are there for more flow?

detailing the TB and matching/transitioning it into the intake mani.
mebbe 2-3%..

is there a bigger TB that will bolt on ?
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Old 12-02-2012, 09:56 AM   #8
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IMO the only meaningful mod you can do the TBI itself is bore the whole thing to a bigger size. Unfortunately it's hard to enlarge the top section that holds the injector and that may be the limiting factor there.

Also, where the tbi fits onto the intake manifold is a circle that is not much bigger than the stock throttle bore so you would need to enlarge that as well.

Honestly, if i was putting together another tbi setup right now id use a carb intake manifold, remove the piece that goes between the carb and manifold, and make a 2-3" tall spacer/adapter to go from that to a 52mm tb off a 3.3L, take the top (fuel) section off the tbi unit, and attach it to the top of the 52mm tb with alumiweld or jb weld. Bigger plenum volume, better transition in the entry, bigger throttle bore. Ive taken the fuel section off the tbi and it does seem to sit on the end of a 46-52mm throttle body pretty well.
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Old 12-02-2012, 10:32 AM   #9
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Holley also sells a 300 CFM single, you could make an adapter plate and bolt that on. Also wondered about having the cal changed a bit and run 2 on the dual carb intake.

But yeah the carb intake, like the MP and the bigger TB modded with the Dodge sensors and injector are the best plan. Still need an OTC and an adjustible fuel regulator to adjust the fueling pressure up.

The Holley TB is short, made for a 2.8 v6. So you'd have room to jack it up for a plenum box under it too.
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Old 12-02-2012, 10:34 AM   #10
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92 would come with roller cam stock.

You should read this to enhance your knowledge.

DDG- N/A cylinder heads

and every page in here

DDG- 2.2/2.5 N/A EFI database
read over the articles, found an instance with a guy with a 92 daytona 2.5 like me used a comp high energy and he said it was a mild yet noticeable increase over stock. If a comp high energy is usable, wouldnt that make a comp magnum usable as well? The car is gonna be daily driven but also raced every weekend at the local strip
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Old 12-02-2012, 10:57 AM   #11
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FI needs engine vac to work right. You'd have to change to megasquirt to have a system that will work with out idle vac from a big cam. Then comes the issue of air. You need more air into the engine, everything is a waste of time until more air gets into the engine.

Like trying to use a big cam with a 2 barrel 318, isn't going to work. Port the head and add a bigger TBI first for more air. Going to a plenum intake with a 58mm TBI like the turbo cars run with megasquirt is another idea for power. NA is different than a turbo though, things like TB size and CFM will decide the RPM range of the engine. Which also decides power levels and cam sizes. Guys run the 280M cam with a blower intake, big plenum and short runners, with a 390 4 barrel Holley bolted on.

The big TB mod for a Fiero is a 300 CFM TB, like the Holley. At 200 CFM the engines RPM range on a 2.2 is 4,000 RPM and less on a 2.5. So look around on the web for CFM calculators and plug in 153 CID (2.5) and 200 CFM and then 300 CFM and see what the RPM range is for them.
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Old 12-02-2012, 09:00 PM   #12
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Did you ever consider swapping to the FFV setup that was used in AA bodies. It was pretty much a T1 turbo intake MPI without the turbo. I thought they ran a lot better then the TBI 2.5.
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