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normo
Regular

Location:
Tamworth NSW
Registered:
November 2004

4age head swap	Sat, 05 February 2005 10:33

I'm so confused so far i have heard on these forums og guys putting 20V heads on 4agze's, or puttin 16V heads on 20V engines. I want to improve power on a 4age, can I bolt on 20V head currently I run a big port with twin side draft carbs, no room to run efi. Will it work? is the main difference in a 20V in the head? [Report message to a moderator]

IRA11Y
Forums Junkie

Club Member

Location:
sydney
Registered:
May 2002

Re: 4age head swap	Sat, 05 February 2005 10:35

I wouldnt call myself an engineer but Id be guessing the difference in the head might have something to do with one bieng called a 20V and the other a 16V [Report message to a moderator]

normo
Regular

Location:
Tamworth NSW
Registered:
November 2004

Re: 4age head swap	Sat, 05 February 2005 10:44

Not nice I can count 20V 16V rthe blocks, the blocks will the 16v block accept the 20v head and give equivalent power to a 20V? That's the question [Report message to a moderator]

feral4mr2
Forums Junkie

Location:
Bundaberg, Qld.
Registered:
May 2002

Re: 4age head swap	Sat, 05 February 2005 12:28

there might be noticable power increase from the extra flow (debatable compared to a 16v bigport head) from useing the 20v head. the 20v engine also uses higher compression ratio to help give it it's extra power output over a 16v 4age. [Report message to a moderator]

normo
Regular

Location:
Tamworth NSW
Registered:
November 2004

Re: 4age head swap	Thu, 10 February 2005 08:13

bummp [Report message to a moderator]

Flem
Regular

Location:
cambo
Registered:
May 2002

Re: 4age head swap	Sat, 12 February 2005 23:56

THE VALVE CUT OUT ON THE PISTONS 4 cut outs compared to 5 not saure if it would hit though [Report message to a moderator]

4agte
Forums Junkie

Location:
Toronto, Downtown
Registered:
September 2004

Re: 4age head swap	Sun, 13 February 2005 00:05

the 20v's also rev more than 16v's [Report message to a moderator]

IRA11Y
Forums Junkie

Club Member

Location:
sydney
Registered:
May 2002

Re: 4age head swap

Sun, 13 February 2005 00:28

Quote:

the 20v's also rev more than 16v's

interesting statement... exactly what do you base this on?

just curious because AFAIK the head is not the limiting factor in peak rpm on a 4AGE , its more to do with crank and stroke , now considering the stroke is still the same across the 4AGE range that leaves the crank. FA uses a 40mm main crank like a bigport and they generally rev @ 10000rpm or so.

ecu rev cut is not an indication of an engines ability to rev, although the manufacturer sets the rev limit based on peak torque and longevity of the engine.

generally a 20V will have the torque higher in the rev range but thats a factor of the flow of the head and cam profile not the ability to rev more.

so what evidence do you have to support the theory?

EDIT: forgot to add CR can be a factor too

[Updated on: Sun, 13 February 2005 00:29]

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