4g61t.org

Specializing in the 3g CSM
It is currently Wed Sep 24, 2025 3:31 am

» »

All times are UTC-05:00



Post new topic  Reply to topic  Page 2 of 12
  [ 172 posts ]  Go to page Previous 1 2 3 4 5 … 12 Next
  Print view Previous topic | Next topic 
Author Message
marck_c
 Post subject:
PostPosted: Sun Jun 10, 2007 3:06 pm 
Offline
Member

Joined: Mon Jun 04, 2007 3:21 pm
Posts: 115
Location: kingston, jamaica
I am now at a cross roads:

Build a 1.6 litre, with the Crower Rods I have know and my ported and polished 1g 4g63 head, with bigger stainless valves, using custom high compression 9.5:1 pistons.

or

Build a 1.75 litre with all of the above, except I would bore the block to accept the 85mm, wiseco 9:1 pistons I already have.

Any thoughts???
Top
   
Reply with quote  
dragstr4g61t
 Post subject:
PostPosted: Sun Jun 10, 2007 4:01 pm 
Offline
1595 cc's of fury

Joined: Wed Apr 23, 2003 3:15 pm
Posts: 1616
Location: Rastle Cock, CO
That is a problem, the 4g63t pistons have a taller piston pin compression height, about 2.55 mm difference. Putting 63 pistons in a 61 will cause it to slam into the head.

As a side note, I made 379.9 hp on a stock internal 1.6L block/ 1.8L head combo using a BB 50 trim at 23-24 psi on pump gas. The only internal mod was a set of HKS 272's. Full spool is around 4,700 rpms in 3rd with base timing only at 5*.

I would think for road racing that some shorter gears would really help keep this motor up in the rpms...plus once boost hits, the short stroke gets to redline quick and loves high rpms.

_________________
Turning a 4g61t into 1595 cc's of FURY!
10.995 @ 134.44 - http://www.youtube.com/watch?v=bZXvcvzuWGQ

SOLD to the fastest shifting hermaphrodite in CO
Top
   
Reply with quote  
marck_c
 Post subject:
PostPosted: Mon Jun 11, 2007 6:54 am 
Offline
Member

Joined: Mon Jun 04, 2007 3:21 pm
Posts: 115
Location: kingston, jamaica
Quote:
As a side note, I made 379.9 hp on a stock internal 1.6L block/ 1.8L head combo using a BB 50 trim at 23-24 psi on pump gas. The only internal mod was a set of HKS 272's. Full spool is around 4,700 rpms in 3rd with base timing only at 5*.
Is that whp or bhp? Which head is the 1.8l? And do you recomend it over the 1.6 or the 2.0?
Top
   
Reply with quote  
Flying Eagle
 Post subject:
PostPosted: Mon Jun 11, 2007 8:40 am 
Offline
The Silent Administrator
User avatar

Joined: Wed Dec 24, 2003 3:32 pm
Posts: 9537
Location: Ottawa, ON, Canada
http://forum.4g61t.org/viewtopic.php?t=14041

The 1.8L head is the perfect compromise for those that cannot modify the stock block, as it keeps the same compression ratio of a 1.6L (no drop in compression ratio due to larger CC combustion chamber), and it maintains 2.0L sized ports in and out of the head. 8)
Top
   
Reply with quote  
marck_c
 Post subject:
PostPosted: Mon Jun 11, 2007 9:50 am 
Offline
Member

Joined: Mon Jun 04, 2007 3:21 pm
Posts: 115
Location: kingston, jamaica
I have a ported and polished 1g 4g63 head, with 1mm oversize stainless steel valves. I would really like to use this head as I already have it. By the looks of things I will have to make custom forged pistons. This being the case I can make them any compression I want (thinking of 9.5 to 1). Will this compensate for the lower cc of the 4g63 head?

I am also concerned about the bore size of the 4g61 when using the 4g63 head. Is the bore size (82mm) wide enough to unshroud the valves?
Top
   
Reply with quote  
dsm90gsx
PostPosted: Mon Jun 11, 2007 4:47 pm 
Offline
Member

Joined: Sun Oct 30, 2005 6:37 pm
Posts: 47
Location: sml va
look its dj,yes the colt does run pretty good!dont let it go to your head dj you know i want that manifold!
landry
Quote:
Many folks are doing these type numbers on very stock long blocks, Hell I produce 330 whp on a tired 270,000 mile motor with a 60-1 running 26psi on pump gas. Good luck keep us informed. Oh yeah I don't spin to 9000rpm but I do run it up to 7400 every day multiple times :)



DJ
www.etmotorsports.com
89 Mirage turbo (Nvisabl)
89 Dodge Colt Turbo (Casper)
91 Talon awd (goldie) slowest 578 whp car on the planet
Quote:
Greetings Gentlemen,

I road race an evo in Jamaica and have done so for 5+ years. For the 2008 season I am building a tube framed chassis car. Our rules dictate that the car must be at a minimum weight based on a formula using the engine displacement. In it's current 2 litre 4g63 form it must weight 2326 lbs. However a 1.6 liter engine would only have to weight 1885 lobs. A 400 lb difference. In road racing weight is everything. The current motor puts out 460 whp and 360 ft.lb tq. In order to maintain the same power to weight ratio with the lighter car I need the 1.6 to put out 370 whp and abput 340 ft.lb tq. Is this realistic??

I have several thousand dollars invested in the 2 liter, and the beaty of the 1.6 is that 95% of the parts are transferable. I beleive the pistons are the only major items that will require a change. Here's what I already have and plan to use:

FP3052 Turbo
Forrester Racing Heads Intake Manifold
DNPerformance Header
Ported & Polished 4G63 1st Gen head
Stainless Steel 1mm Oversize valves
Crower Valve Springs w/ Titanium Retainers
HKS 264/272 cams
Crower 1st Gen Rods
ARP Head Studs
Haltech E6S ECU
Moroso Aluminum Road Race Baffled Oil Sump
Davis Craig Electric Water Pump
Mitsubishi Stainless Steel Headgasket
ARP Main Studs
2.5 Inch Custom Intake Plumbing
Evolution 8 FMIC
3 Inch Stainless Downpipe
Tial 44mm Wastegate
VP C-16 Race Fuel

This is not a B/S post or build. I plan to rev it to 9000 rpm with the above mentioned figures. I would like some thoughts on the plans. I have read some discussion here about the suitability of the 1st Gen 4G63 Head regarding Compression Ratios, can anyone comment?
Top
   
Reply with quote  
dragstr4g61t
 Post subject:
PostPosted: Mon Jun 11, 2007 6:30 pm 
Offline
1595 cc's of fury

Joined: Wed Apr 23, 2003 3:15 pm
Posts: 1616
Location: Rastle Cock, CO
Quote:
Quote:
As a side note, I made 379.9 hp on a stock internal 1.6L block/ 1.8L head combo using a BB 50 trim at 23-24 psi on pump gas. The only internal mod was a set of HKS 272's. Full spool is around 4,700 rpms in 3rd with base timing only at 5*.
Is that whp or bhp? Which head is the 1.8l? And do you recomend it over the 1.6 or the 2.0?
That was whp on a dynojet which can be a little high.

I would definately just get pistons made, and since your doing that then you might as well have them made for a larger bore of 85.5 mm and you can compensate for the compression loss of the 2.0 head.

_________________
Turning a 4g61t into 1595 cc's of FURY!
10.995 @ 134.44 - http://www.youtube.com/watch?v=bZXvcvzuWGQ

SOLD to the fastest shifting hermaphrodite in CO
Top
   
Reply with quote  
sketzshane
 Post subject:
PostPosted: Thu Jun 14, 2007 11:27 am 
Offline
Member
User avatar

Joined: Mon Feb 26, 2007 3:16 pm
Posts: 144
Location: Florida/Jamaica
From one Jamaican to another. I would tell u to build up the 1.75 motor but thats me(more displacement = less boost). Marck u have been one of my main inspirations... because I have always dreamed of racing my ole Evolution 3 and i sold due to responsibilities but now I am building up my 1988 Cyborg in Jamaica to race at dover too...u have recently sent me the dover rules.... I expect to see great things when this car is finished 8)
Top
   
Reply with quote  
marck_c
 Post subject:
PostPosted: Thu Jun 14, 2007 3:28 pm 
Offline
Member

Joined: Mon Jun 04, 2007 3:21 pm
Posts: 115
Location: kingston, jamaica
Quote:
From one Jamaican to another. I would tell u to build up the 1.75 motor but thats me(more displacement = less boost). Marck u have been one of my main inspirations... because I have always dreamed of racing my ole Evolution 3 and i sold due to responsibilities but now I am building up my 1988 Cyborg in Jamaica to race at dover too...u have recently sent me the dover rules.... I expect to see great things when this car is finished
Please dont' let the cat out of the bag.
Top
   
Reply with quote  
sketzshane
 Post subject:
PostPosted: Fri Jun 15, 2007 10:06 am 
Offline
Member
User avatar

Joined: Mon Feb 26, 2007 3:16 pm
Posts: 144
Location: Florida/Jamaica
I wouldnt do that that is your project... I have nothing to gain.... but otherwise I dont know if u know but there are few of us wheeljamaica members here on this site also mainly from the Mitsubishi section. If u wanted to keep your project a secret you shouldnt have given so much information and use your wheels sign in name. Thanks again for the dover rules u sent me. I am F.I Cyborg Racer on wheelsjamaica (Mitsubishi Moderator) and as a Mitsubishi lover I hope to see to do well at the Dover meet on the 24th.

Below is my project I have posted in the Technical Projects on wheelsjamaica

http://www.wheelsjamaica.com/wheels_for ... ic=62309.0
Top
   
Reply with quote  
marck_c
 Post subject:
PostPosted: Sun Sep 09, 2007 7:15 pm 
Offline
Member

Joined: Mon Jun 04, 2007 3:21 pm
Posts: 115
Location: kingston, jamaica
Well after months of planning, I finally fired up the MIG welder and the bandsaw, and started fabbing up the chassis for this project...
Image

Image

Image

Image
Top
   
Reply with quote  
89coltgt
 Post subject:
PostPosted: Sun Sep 09, 2007 8:27 pm 
Offline
Some call me a god
User avatar

Joined: Sat Nov 20, 2004 10:53 pm
Posts: 2347
Location: Missouri
Looks like a nice project, keep the pics coming :twisted:

_________________
John
89 Colt GT(2)
88 d50 4g63t, crower 272's, dsmlink
Top
   
Reply with quote  
marck_c
 Post subject:
PostPosted: Mon Sep 10, 2007 1:13 pm 
Offline
Member

Joined: Mon Jun 04, 2007 3:21 pm
Posts: 115
Location: kingston, jamaica
Image

Image

Image
Top
   
Reply with quote  
marck_c
 Post subject:
PostPosted: Sat Mar 08, 2008 9:04 am 
Offline
Member

Joined: Mon Jun 04, 2007 3:21 pm
Posts: 115
Location: kingston, jamaica
Well it's been several months into the project, and I have'nt been idle. Here are some pics of the engine coming together...

Image

4G63 Head with 1mm Oversize Ferrea Stainless Steel Valves, Ported and Polished, Valves Unshrouded. Ferrea Dual Valve Spring with Titanium Retainers. Ferrea Bronze Valve Guides, knocked down slightly for improved flow.

Image

Image

Image

83.5 mm Custom Ross High Compression Pistons, ARP Head Studs

Image

Balanced Rotating Assembly, Carillor Rods, ARP Mains Studs[/img]

Image

Image

Fludiampr Damper. Gonna need it to spin this baby to 10,000 rpm+!!
Top
   
Reply with quote  
89coltgt
 Post subject:
PostPosted: Sat Mar 08, 2008 11:09 am 
Offline
Some call me a god
User avatar

Joined: Sat Nov 20, 2004 10:53 pm
Posts: 2347
Location: Missouri
Very nice, how much did the custom rods run you for the 4g61? What compression are they w/the 4g63 head?

_________________
John
89 Colt GT(2)
88 d50 4g63t, crower 272's, dsmlink
Top
   
Reply with quote  
Display posts from previous:  Sort by  
Post new topic  Reply to topic  Page 2 of 12
  [ 172 posts ]  Go to page Previous 1 2 3 4 5 … 12 Next

» »

All times are UTC-05:00

Who is online

Users browsing this forum: No registered users and 9 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Limited