2.5 internals, 16v head and tall gears. Good mix? - Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more!
Engine - Turbo & Block Modifications and upgrades to maximize your Dodges turbo output & Improving strength and durability - pistons to crank.

 
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post #1 of 10 Old 03-07-2013, 05:34 PM Thread Starter
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2.5 internals, 16v head and tall gears. Good mix?

I have an '89 Daytona C/S 2.2 T2. Everything is stock except the 3' exhaust. I am planning on switching over to a 16v head. To save money I was thinking about taking the pistons and crank from a 2.5 T1 so I don't have to pick up new pistons for valve clearance issues. I'm aware that the 2.5 would cause spinning issues in lower gears. I took the transmission out of a different car, it is an A555, and it was modified so that the gears are a bit higher, basically first was removed and it was given 6th instead. I don't know what they did but basically the ratio is raised about 25%.

What I'm wondering is if I will still have spinning issues or if the extra torque will be helpful? I don't tend to race but I do greatly enjoy the rolling start runs. Also, will the 2.5 pistons handle 350 hp crank(this won't happen for some time though)?

I found four threads, all from this link:

Which Would Be Better, 2.2 Or 2.5?- Thread links

and I found most of the answers I was looking for but couldn't find anything to help on those two questions. I'm thinking the best bet is just spend the extra couple and buy the new pistons but I'm just not sure with the taller gears.
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post #2 of 10 Old 03-07-2013, 07:08 PM
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Re: 2.5 internals, 16v head and tall gears. Good mix?

Why not just swap a 2.4 turbo long block? They can be have for less than $1000.
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post #3 of 10 Old 03-07-2013, 07:47 PM
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Re: 2.5 internals, 16v head and tall gears. Good mix?

Heck, I got a '95 2.4 longblock for $92 at the local JY.. It's just a set of SRT4 rods/pistons away from being a turbo motor. heh
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post #4 of 10 Old 03-07-2013, 08:36 PM Thread Starter
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Re: 2.5 internals, 16v head and tall gears. Good mix?

I'm thinking about going with the 2.5 stuff because I can scavenge that for free from the yard. We have about 10 Daytonas around the house. I think 4 are T2s as well.

I'm a university student so I'm trying to save money. Will an srt-4 bolt to an A555?
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post #5 of 10 Old 03-07-2013, 08:50 PM
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Re: 2.5 internals, 16v head and tall gears. Good mix?

Yes, the 2.4L motor bolts up to the TD transmissions. And they use the TD flywheel/clutch. And it doesn't have to be an SRT4 2.4, any 2.4 will work, just put better rods/pistons in it. You can even use TD rods in a 2.4.. :) You can't scavenge a nearly free 16v head for a 2.5 from the JY. At best, you'd use a 2.0/2.4 head, and spend hundreds of dollars on the parts/machining to make a 2.5 hybrid motor.
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post #6 of 10 Old 03-07-2013, 08:58 PM Thread Starter
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Re: 2.5 internals, 16v head and tall gears. Good mix?

I have free access to a 16v head, intake and exhaust. I have a couple hundred dollars coming in here that I was planning on spending on parts to get the head to fit and through the extra breathing room would be best.

I'm guessing from the last part of Una's post that this is not the best way to go?
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post #7 of 10 Old 03-07-2013, 09:23 PM
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Re: 2.5 internals, 16v head and tall gears. Good mix?

Quote:
Originally Posted by CodeZen View Post
I'm guessing from the last part of Una's post that this is not the best way to go?

Do your research and see how much people have spent.

We have a sub section of the forum have nothing but 16V conversion questions.

16v Conversion - Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more!
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post #8 of 10 Old 03-07-2013, 09:53 PM Thread Starter
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Re: 2.5 internals, 16v head and tall gears. Good mix?

Thanks for the heads up on that. Didn't know about that yet.
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post #9 of 10 Old 03-09-2013, 11:15 PM
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Re: 2.5 internals, 16v head and tall gears. Good mix?

BTW if you have very little money, a few hundred $ you should consider just going 3 bar with the 8v engine...

Stage 1 build thread, Getting to 20 PSI

yes 16v is great, but not super cheap for 99% out there. You can get FFV injectors and a $35 3 bar map and get the stage 5 and make some power with a stock T2 top end. Cheap...
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post #10 of 10 Old 03-10-2013, 01:33 PM
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Re: 2.5 internals, 16v head and tall gears. Good mix?

Quote:
Originally Posted by Una View Post
Yes, the 2.4L motor bolts up to the TD transmissions. And they use the TD flywheel/clutch. And it doesn't have to be an SRT4 2.4, any 2.4 will work, just put better rods/pistons in it. You can even use TD rods in a 2.4.. :) You can't scavenge a nearly free 16v head for a 2.5 from the JY. At best, you'd use a 2.0/2.4 head, and spend hundreds of dollars on the parts/machining to make a 2.5 hybrid motor.

It bolts up but it needs some modifying, not for the faint of heart, plus the starter has clearance issues on certain blocks.

Cast pistons will take 350 hp, its not the boost but being lean and detonation that kill pistons, 2.5's are more fragile than 2.2 pistons so it doesn't take much abuse to kill them.
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