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Old 06-05-2013, 01:24 PM   #21
MainiaxMotorsports
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i did some compression calculations using my 2.5L block with 2.3L head - not sure it is perfect

looks like we should do 11:1 - however will be at the sake of that larger intake port bank - dang those are big ports....

next project is 2.5L head with 2.3L cams - Sporadic might have it done already??


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Old 06-05-2013, 01:48 PM   #22
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I'll be using 2.0 cams in the 2.5 head. (I still think I have two 2.0 heads on my bench, so I'm not sure I even have a 2.3 head. MainiaxMotorsports are you sure that was a 2.3? All measurements are the same as a 2.0)

Since the 2.5 combustion chamber is the same size as a 2.0 head, I see no reason why the compression ratio would be altered. As long as the cylinder bores are good I'll be using P4-DU875-N2 Supertech 10.4:1 pistons. I actually have two sets of these at the moment after being duped by another member into thinking I was buying 88mm Supertechs. That's another story.

The 2.0 block I'm using is from my original motor that blew a ring landing. Amazingly there is no apparent damage to the cylinder walls or valves. All the loose aluminum bits were in the oil pickup tube, and probably the oil filter.

As far as progress, I'm still gathering last-minute parts. I'm focusing on house remodeling at the moment and will come back to this soon.
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Old 06-05-2013, 02:24 PM   #23
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MM go no smaller then the 2.3 cams , In my opinion I would do a set of stg 3 cams for what your doing

Your not going to get much from the 2.5 head doing small 2.0 or 2.3 cams , you need the extra flow to keep the velocity up or the larger head is worthless if you only going to flow the amount of a stock 2.3 cams capability

Just my opinion

Tom
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Old 06-05-2013, 03:14 PM   #24
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Du have 2 sets? 88mm?



Quote:
Originally Posted by sporadic View Post
I'll be using 2.0 cams in the 2.5 head. (I still think I have two 2.0 heads on my bench, so I'm not sure I even have a 2.3 head. MainiaxMotorsports are you sure that was a 2.3? All measurements are the same as a 2.0)

Since the 2.5 combustion chamber is the same size as a 2.0 head, I see no reason why the compression ratio would be altered. As long as the cylinder bores are good I'll be using P4-DU875-N2 Supertech 10.4:1 pistons. I actually have two sets of these at the moment after being duped by another member into thinking I was buying 88mm Supertechs. That's another story.

The 2.0 block I'm using is from my original motor that blew a ring landing. Amazingly there is no apparent damage to the cylinder walls or valves. All the loose aluminum bits were in the oil pickup tube, and probably the oil filter.

As far as progress, I'm still gathering last-minute parts. I'm focusing on house remodeling at the moment and will come back to this soon.
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Old 06-05-2013, 03:16 PM   #25
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Quote:
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Du have 2 sets? 88mm?
I have 2 sets of 87.5mm, 10.5:1 CR on a 2.0, 11.6:1 on a 2.3. See chart HERE
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Old 06-05-2013, 07:18 PM   #26
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That's to high for fi :( lol daaammm


Quote:
Originally Posted by sporadic View Post
I have 2 sets of 87.5mm, 10.5:1 CR on a 2.0, 11.6:1 on a 2.3. See chart HERE
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Old 06-12-2013, 07:43 PM   #27
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May I ask if anyone of you guys have tried running a 2.5 Duratec bottom end with the 2.3 Duratec head and cams, and what was the results like as far as dyno'd power and reliability.. Also any problem with the blocked oil feed in the block?
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Old 06-12-2013, 09:59 PM   #28
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Hey Bud - yeah - i am running the 2.5L bottom with a 2.3L head - 2.3Cams, oil pickup, etc.

Not dyno'd yet but with the Coswroth style IM - port polished head, and smoothed out TB i suspect she will do 180hp at the crank on race gas. Compression calculates at 11:1 or so - hence will only be running race gas to try to eliminate detonation.

Axles go back on this weekend - will post some road test / BUTT DYNO vids

sounds amazing to be honest

ps. NOT first start - ran it before i got the camera on

http://www.youtube.com/watch?v=vK3Wq7Y9Nuw
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Old 06-12-2013, 09:59 PM   #29
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2.5L w/ 2.3L stock head/valves/cams

YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
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Old 06-12-2013, 10:00 PM   #30
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Ps. Sporadic - did we find the specs on the 2 vs 2.3L head intake ports? I have been on the road and have not measured yet. If you find the answer first just PM me and i iwll get the other head shipped out stat!
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