is there a differance between 32v and 16v bottom ends

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seattlesweet

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Mar 17, 2004

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Oct 13, 2004

#1

• Oct 13, 2004

• #1

besides the obvious aluminum for the cobra and cast for the gt is there any other differances i thought it would be cool to do a fr500 32v upper end with a cast bottom end with the cobra crank with some heavey duty pistons and rings

 

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ChrisWeil

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#2

• Oct 13, 2004

• #2

The stock bottom end on GTs and pre-'03 Cobra's are all the same, basically, minus a little bit different piston to equate for the difference in compression, and the forged vs. cast crank. '03 and up Cobras are much different.

What do you mean a "cast" bottom end? You mentioned "heavy duty" pistons and rings, for which I'm assuming you meant forged, and you also wanted a forged cobra crank, so that would leave using cast connecting rods...why would you do a thing like that?

An all forged bottom end with 11.0-12:1 compression with mach1/cobra or fr500 heads would be a good N/A motor.

 

nickthegenius

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Dec 23, 2002

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Oct 13, 2004

#3

• Oct 13, 2004

• #3

ChrisWeil said:

What do you mean a "cast" bottom end?

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I think he meant the Cobras have aluminum blocks and GTs have a cast iron block. Could be wrong. BTW, as far as forged components go, the GT crankshaft is actually fairly strong (up to 500hp or so). Its the rods and pistons you need to worry about.

ChrisWeil said:

fr500 heads would be a good N/A motor.

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And where would one find FR500 heads?

 

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GinoGT

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#4

• Oct 13, 2004

• #4

The rods on everything but 03/04 Cobras are some powered metal construction. I believe the rods on the N/A 4V engines are a bit stronger though to deal with the higher redline.

Forged pistons and rods in an aluminum block is the way to go. The forged crank isn't as necessary unless you're making insane amounts of power, the GT crank is a pretty good unit.

A plus with the aluminum block is the ability to do a big bore setup.

 

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Pitch Black

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#5

• Oct 13, 2004

• #5

All OHC 2V's have iron blocks (not sure about the 5.0's). All OHC 32V's (except 03+) have aluminum blocks.

All OHC 32V's have a forged crank (except Mach 1 auto's).

 

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tangerine

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Oct 13, 2004

#6

• Oct 13, 2004

• #6

4v block is aluminum and the 2v is iron.
the rods are stornger due to the increased rpm range. the pistons are the same but with a different cc's. the thing that will let go in a 4.6 first is the rods. I had a motor come to me yesterday with a big hole in the side of the block. the pistons are ok but if you are going with a power adder then definately go with forged internals. about the crank they are rated to 500hp but I have yet to see a broken crank. If anyone has seen one on the internet put a link up. I would like to look at it and see what all it has broken and what it took 2 break it.

 

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bdcardinal

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Jun 10, 2003

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Oct 13, 2004

#7

• Oct 13, 2004

• #7

Pitch Black said:

All OHC 2V's have iron blocks (not sure about the 5.0's). All OHC 32V's (except 03+) have aluminum blocks.

All OHC 32V's have a forged crank (except Mach 1 auto's).

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2v explorers have aluminum blocks.

the 32v marauders have cast cranks.

 

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Pitch Black

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#8

• Oct 13, 2004

• #8

bdcardinal said:

2v explorers have aluminum blocks.

the 32v marauders have cast cranks.

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We're refering to the versions going into Mustangs here

 

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bdcardinal

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#9

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• #9

when was that mentioned? i am mearly bring information to the table. also the 3v motors in the 05 mustang GTs are aluminum.

 

hotmustang331

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Apr 29, 2004

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#10

• Oct 13, 2004

• #10

While on the subject, what exactly is the rev limit of the 4V engines?( I know red line is 6800 but where the limiter actually hits)I believe 2V is 6250(red line at 5800) so basically its ONLY the rods that hold back the RPMs?And how many RPMs will the stock GT crank take?

 

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seattlesweet

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Oct 14, 2004

#11

• Oct 14, 2004

• #11

ok here is the deal i just wanted to know if there was a differance between the aluminum and the iron blocks because i wanted to build a iron block with the 32v fr500 heads with some extra strong lower end pistons with the cobra crank to go in my 01 cobra i am not interseted in supercharging or n2o i just want a naturely asperated 32v that can withstand a whole lot of abuse

 

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thebeastum

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#12

• Oct 14, 2004

• #12

can you swap the gt heads for cobra heads? will they bolt up?

 

CATMACH

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Oct 14, 2004

#13

• Oct 14, 2004

• #13

hotmustang331 said:

While on the subject, what exactly is the rev limit of the 4V engines?( I know red line is 6800 but where the limiter actually hits)I believe 2V is 6250(red line at 5800) so basically its ONLY the rods that hold back the RPMs?And how many RPMs will the stock GT crank take?

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My Mach hits the rev limiter just after 7000. I think its 7050. Autos have a lower limit, about the same as GT's I think.

 

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bdcardinal

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#14

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• #14

just one question. where are you getting FR500 heads?

 

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Pitch Black

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#15

• Oct 14, 2004

• #15

thebeastum said:

can you swap the gt heads for cobra heads? will they bolt up?

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No, it isn't that simple. Sure they should bolt up...but there is a hell of a lot more that goes into the swap than just swapping heads

bdcardinal said:

just one question. where are you getting FR500 heads?

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http://www.gefracing.com/Merchant2/...&Product_Code=M6049D46&Category_Code=46ENGINE

 

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GinoGT

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#16

• Oct 14, 2004

• #16

Pitch Black said:

http://www.gefracing.com/Merchant2/...&Product_Code=M6049D46&Category_Code=46ENGINE

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Those are just 2v heads.

 

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bdcardinal

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#17

• Oct 14, 2004

• #17

ya those arent FR500 heads, those are a NPI style head, but that flows really well. FR500 heads are DOHC and from what i remember really expensive/impossible to find.

 

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Pitch Black

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#18

• Oct 14, 2004

• #18

Oh, I thought they were talking about 2V heads. I'd have to do a bit more research but I do know they offer 4V heads too

 

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bdcardinal

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#19

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• #19

http://www.seanhylandmotorsport.com...id=96&osCsid=2e2ed2877c1d91383f03894d77cdd247

those are FR500 cylinder heads. they are like 8grand for the port job, plus you need the core

 

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GinoGT

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#20

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• #20

SHM is the king of all ripoffs. $260 for an aluminum driveshaft