What's the maximum Reliable RPM Limit on the 4G63 Head
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Newbie
Joined: Mar 2003
Posts: 42
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From: kingston, jamaica
What's the maximum Reliable RPM Limit on the 4G63 Head
Hi folks. I'm building a high rpm 4g61, with a 4g63 head. I'm curious to know what are your views regarding the maximum rpm limit is, based on the design of these cylinder heads. Please don't flood with comments about not needing to rev the engine high at all. This project is being built for a specific purpose, which necessitates high rpm operation. Look forward to your answers.
Thread Starter
Newbie
Joined: Mar 2003
Posts: 42
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From: kingston, jamaica
The 4G61T came in the late eighties Mitsubishi Mirage. It is a 1595cc version of the 4G63T. The block is identical to the 63. The big differences being the deck height is shaves 6mm. In addition the stroke is 75.5mm as opposed to the 63's 88mm. The bore is 82.5mm stock. This yeilds a far superior rod ratio to the 63. The rods and cylinder head are interchangeble with the 63.
My setup:
Custom 83.5mm 10.0:1 Ross Pistons
Carillo Rods w/ ARP Fastners
ARP Head Studs, Mains, etc
MLS Head Gasket
Brian Crower Stage 3 Cams
Ferrea Dual Interferance fit Springs, w/Ti Retainers
Adjustable Gears
DNPerformance Tubular Header
FP3052 Turbocharger
Ferrea 1mm OS Valves
Extrude Honed Stock Intake Manifold
Ported and Polished 1g Head
Fluidampr Harmonic Balancer
Custom Moroso 3-Stage Dry Sump Kit
Evolution 8 Intercooler
Haltech E6X ECU
My setup:
Custom 83.5mm 10.0:1 Ross Pistons
Carillo Rods w/ ARP Fastners
ARP Head Studs, Mains, etc
MLS Head Gasket
Brian Crower Stage 3 Cams
Ferrea Dual Interferance fit Springs, w/Ti Retainers
Adjustable Gears
DNPerformance Tubular Header
FP3052 Turbocharger
Ferrea 1mm OS Valves
Extrude Honed Stock Intake Manifold
Ported and Polished 1g Head
Fluidampr Harmonic Balancer
Custom Moroso 3-Stage Dry Sump Kit
Evolution 8 Intercooler
Haltech E6X ECU
Last edited by marck_c; Apr 28, 2008 at 01:43 PM.
the max rpm of the head would be determined by the valve springs and the lifters.
eg. if your springs can handle 10,000rpm and your lifter can handle 9000rpm then your head can handle 9000rpm. The bottom end is a different story
Which lifters do you have?
With 10.1 comp what oct gas are you using?
This is a race setup, what are you doing (dexterity, hillclimb)?
post some pictures of your setup
eg. if your springs can handle 10,000rpm and your lifter can handle 9000rpm then your head can handle 9000rpm. The bottom end is a different story
Which lifters do you have?
With 10.1 comp what oct gas are you using?
This is a race setup, what are you doing (dexterity, hillclimb)?
post some pictures of your setup
Evolving Member
Joined: Feb 2006
Posts: 285
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From: Glendale Heights, IL
With a cam lift under 11 mm, and a good set of valve springs such as kiggly racing's set, 10,000 rpm isn't a problem. I'm running a set of Brian Crower 280's and the Kiggly springs. I reved it to 10,000 rpm several times, and 9750 a whole season without any issues.
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Thread Starter
Newbie
Joined: Mar 2003
Posts: 42
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From: kingston, jamaica
the max rpm of the head would be determined by the valve springs and the lifters.
eg. if your springs can handle 10,000rpm and your lifter can handle 9000rpm then your head can handle 9000rpm. The bottom end is a different story
Which lifters do you have? OEM 1st Gen
With 10.1 comp what oct gas are you using? E85
This is a race setup, what are you doing (dexterity, hillclimb)? Road Race
post some pictures of your setup
eg. if your springs can handle 10,000rpm and your lifter can handle 9000rpm then your head can handle 9000rpm. The bottom end is a different story
Which lifters do you have? OEM 1st Gen
With 10.1 comp what oct gas are you using? E85
This is a race setup, what are you doing (dexterity, hillclimb)? Road Race
post some pictures of your setup
Evolving Member
Joined: Mar 2007
Posts: 272
Likes: 0
From: In front of a Catia screen
If you really want ot spin the snot out of a dsm head, there is a company that makes solid lifters.. I think it was B.R.E. or C.R.E...
google search for solid lifter 4g63, and i think it ought to pop up...
Correction... it was B.L.E.
the old extreme race car used them...
google search for solid lifter 4g63, and i think it ought to pop up...
Correction... it was B.L.E.
the old extreme race car used them...
Last edited by 4G63DSM; Apr 28, 2008 at 10:35 AM. Reason: correction
https://www.jacksonautomachine.com/h...m?sectionId=17
Here is the link, second item down.
Greg from GSC first put me on these, I called JAM and and spoke with them. Call them and speak with Camila it incredible how much she knows.
I dont know how high you want to rev but 9000-9500 can be done on HYD lifters and you dont have to go to solid.
Spend some pics of Dover
Here is the link, second item down.
Greg from GSC first put me on these, I called JAM and and spoke with them. Call them and speak with Camila it incredible how much she knows.
I dont know how high you want to rev but 9000-9500 can be done on HYD lifters and you dont have to go to solid.
Spend some pics of Dover
