What is involved in building a 2.5 TIII?
I just picked up a Spirit RT that is supposed to have a 2.5 TIII setup. Would like to know what is needed for that so I can verify it. I guess I can measure the stroke w/ a rod through the plug hole. From what I read, stock 8v 2.5 pistons would fit but cause a lower compression ratio. The proper way is to use the custom ones FWD-P sells?
I'm hoping it has all this and was done right :eek:
Re: What is involved in building a 2.5 TIII?
Sounds like a good plan and you could probably use a small bore scope camera like what we use at work for finding leaks in walls and peering down sewer pipes to look at the tops of the pistons for the 4 valve reliefs. I have a 2.5L TIII short block here on a stand and the pistons are forged Venolias from FWDP. They look just like a 2.5L TI piston top, but two more valve reliefs. I would guess the compression ratio might be a bit on the low side but I would not take my uneducated guess as fact..
Have you driven it yet? Thoughts/opinions on the combo?
Re: What is involved in building a 2.5 TIII?
Haven't driven it yet, car's pretty gutted, tank's out, rad's out, seats, interior pieces and bunch of other parts stuffed inside. Engine and trans are installed but were not connected otherwise. I just finished hooking up all the factory plugs to verify they were still there (car had a Megasquirt installed and removed). I'll start a project log on it here shortly. Just been too cold since I picked it up to do much.
Re: What is involved in building a 2.5 TIII?
I think the stick through the plug hole is probably the easiest and most unequivocal test you could do if you're just trying to figure out if it's 2.2 or 2.5.
Re: What is involved in building a 2.5 TIII?
The guy I got it from says he's 99.9 percent sure it has the forged FWD-P pistons in it. He got it from a guy named Kevin Geary on the RT mailing list. Anybody know him that can ask and verify for me?
Re: What is involved in building a 2.5 TIII?
I've got a stock 2.5L block from my Daytona IROC with the TIII head in my Spirit right now running on the Neil Emiro TIII cal. I don't get on it too hard and havn't taken it much over 5000RPM. My new BoostButton cal should be here in a couple days.
Re: What is involved in building a 2.5 TIII?
Some pics of the 2.5L TIII Venolias I have.
Attachment 53905Attachment 53906
Re: What is involved in building a 2.5 TIII?
And here is a Wiseco 2.5L TIII piston from TU.
Attachment 53907Attachment 53908
Re: What is involved in building a 2.5 TIII?
I'll have to stick a bore scope down the plug hole and see what it looks like.
Re: What is involved in building a 2.5 TIII?
you could probably feel around for the valve reliefs with the stick you were thinking to use to measure the stroke
Re: What is involved in building a 2.5 TIII?
So I verified it is a 2.5 (stroke is over 4"), and borrowed my buddy's bore cam and it there are 4 valve reliefs in each piston. So I feel safe in assuming it has the forged 2.5 TIII pistons in it. Turns over by hand and feels like it has good compression. Now I just need to put a tank back in it and make it run!
Re: What is involved in building a 2.5 TIII?
Quote:
Originally Posted by
Dr. Johny Dodge
you could probably feel around for the valve reliefs with the stick you were thinking to use to measure the stroke
This - http://www.ebay.com/itm/2M-Mini-Wate...item20f876859f
Re: What is involved in building a 2.5 TIII?
You can probably use the bore cam to determine the brand of the pistons if need be. If you look at the piston pics I posted, the Venolias have a simple angled dish 'wall' (like 2.5L TI pistons); the Wisecos have a concave dish wall like a skateboard ramp. Those two brands are probably the most common "2.5L TIII" aftermarket forged piston by far, although I would swear the dish on the Venolias are a little deeper.
Re: What is involved in building a 2.5 TIII?
Pretty sure they had an angled dish wall.
Re: What is involved in building a 2.5 TIII?
Not to hi jack the thread but it seems to have died off and this is along the lines of the original title of the thread. What really is involved in building a 2.5 TIII? Can you take a 2.5L block, stick the custom 2.5L TIII pistons in it and then bolt up the head with no further work? Unlike the hybrid setups that require custom machining and etc. Any more info would be great. Thanks.
Re: What is involved in building a 2.5 TIII?
I wouldn't use pistons as a way to verify looking thru the hole, I'd pull the pan and look at the crank for the 2.5 stamping.
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Quote:
Originally Posted by
Dan15
Not to hi jack the thread but it seems to have died off and this is along the lines of the original title of the thread. What really is involved in building a 2.5 TIII? Can you take a 2.5L block, stick the custom 2.5L TIII pistons in it and then bolt up the head with no further work? Unlike the hybrid setups that require custom machining and etc. Any more info would be great. Thanks.
You need 2.5 TIII pistons and a 2.5 common block crank and a cal, that's it. ALL CB blocks are interchangeable except the TIII block is better cast and doesn't have a dizzy hole. The TII block doesn't have provisions for balance shafts. The part number for the 2.2 TIII balance shafts are different so if swapping to a 2.5, eliminate them or run the 2.5 shafts.
Re: What is involved in building a 2.5 TIII?
Good luck on a Cal for it. My first boost button cal wasn't right, and he said I was the first 2.5 TIII tune he has tried to do. Still waiting on an update. Went back to the old Neil Emiro cal meant for a stock TIII as it ran better. Other than that the car has ran flawless for about 10K miles with the 2.5 CB out of my T1 Daytona with the TIII head on it. No special TIII pistons, just the factory 2.5 T1 pistons. Bumped it up to 10lbs of boost. A/F ratios are good all the way through RPM range.
Re: What is involved in building a 2.5 TIII?
I've been running a 2.5 TIII since 2007, Rob did his best but its a different beast. Cliff Ramsdel was the first IIRC and he kept blowing head gaskets using the TIII SBEC. I kept the dizzy so maybe that's why she stayed together? Rob did a few but found doing my own worked best.
Interesting on using 8 valve pistons, the compression is in the 7:1 range. :(
I think a 2.5 TIII is good for an auto and heavy car/van but going to try a 2.2, mainly because I am switching to a 5 speed and I have a few 2.2 pistons kicking around, damaged another piston after having injector issues, :(
Re: What is involved in building a 2.5 TIII?
You might miss that 2.5 torque for that heavy van...
Re: What is involved in building a 2.5 TIII?
Quote:
Originally Posted by
turbovanmanČ
I've been running a 2.5 TIII since 2007, Rob did his best but its a different beast. Cliff Ramsdel was the first IIRC and he kept blowing head gaskets using the TIII SBEC. I kept the dizzy so maybe that's why she stayed together? Rob did a few but found doing my own worked best.
Interesting on using 8 valve pistons, the compression is in the 7:1 range. :(
I think a 2.5 TIII is good for an auto and heavy car/van but going to try a 2.2, mainly because I am switching to a 5 speed and I have a few 2.2 pistons kicking around, damaged another piston after having injector issues, :(
How sketchy is the 2.5 hybrid in comparison? I don't think I buy the idea that 2.5 only belongs in heavy stuff because literally I bought it.
More seriously though, unless your quench is rubbish, you guys are way off on these tunes. If every 2.5 16 valve ever built couldn't take the timing needed to make good power then I would think there is a problem. There must be some 16 valve exceptions out there beyond the 2.5L 8 valves.