i bought a VB commo from a mate and in the boot was a 186S block. I decided to work it and chuck it in a LJ. So far ive had it acid dipped, got flattop pistons and a solid crank. I also got a 173 head and im going to get some work done to it. What else do you think i should get for it/done to it?
My 186S: What should i do
Started by
_Phoenix_
, May 10 2006 08:45 PM
15 replies to this topic
#2
_CHOPPER_
_CHOPPER_
-
- Guests
Posted 10 May 2006 - 09:08 PM
What is your budget and what are you trying to achieve?
#3
Heath
View Garage
-
- Administrators
-
- 18,319 posts
I like cars.
- Name:Heath
- Location:Eastern Suburbs, Melbourne
- Car:Heavily Modified UC Sunbird Hatchback
- Joined: 07-November 05
View Garage
Posted 10 May 2006 - 09:13 PM
All depends on how much money you're spending. What carb/carbs will you be running?
I'd get some port work and oversized valves, electronic ignition etc, maybe some roller rockers to make her rev a little bit more easily?
Anything you want... Starfire Rods could help you out, a nice cam?
I'd get some port work and oversized valves, electronic ignition etc, maybe some roller rockers to make her rev a little bit more easily?
Anything you want... Starfire Rods could help you out, a nice cam?
#4
_Phoenix_
_Phoenix_
-
- Guests
Posted 10 May 2006 - 09:53 PM
Im hoping to achieve a decent amount of power. I was told it has a stage 1 cam but i dont know how to tell and they guy who told me is a idiot. My budget is around $1k maybe 1.5. Ive already organised some roller rockers. Im hoping to run triple su's
#5
_CHOPPER_
_CHOPPER_
-
- Guests
Posted 10 May 2006 - 10:00 PM
The triple carbs and a properly modofied head should take care of close to $1000. This of course depends on how cheaply you can get second hand parts.
#6
Pop's-SS
-
- Members
-
- 4,963 posts
Pops
- Name:Barry
- Location:Riverina South West Slopes
- Car:1976 Mandarin Red SS Hatchback
- Joined: 08-November 05
Posted 10 May 2006 - 10:04 PM
G'day Phoenix
Harry Firth put a 161 head on a 186 for a good result but I am not too sure if the 173 will do the same job.
A 186-S in standard trim ie twin choke carby, headers, bigger valves, heavier valve springs and a slight cam gave out 145HP.
Have you thought of putting on a quadrajet carby instead of triples? Mabybe easier to tune.
Good luck on your project
Regards ................... Barry
Harry Firth put a 161 head on a 186 for a good result but I am not too sure if the 173 will do the same job.
A 186-S in standard trim ie twin choke carby, headers, bigger valves, heavier valve springs and a slight cam gave out 145HP.
Have you thought of putting on a quadrajet carby instead of triples? Mabybe easier to tune.
Good luck on your project
Regards ................... Barry
#7
_Phoenix_
_Phoenix_
-
- Guests
Posted 10 May 2006 - 10:10 PM
the carbys would be extra ontop of my budget. the quadrajet sounds like a good idea, ill have a look into it
#8
Heath
View Garage
-
- Administrators
-
- 18,319 posts
I like cars.
- Name:Heath
- Location:Eastern Suburbs, Melbourne
- Car:Heavily Modified UC Sunbird Hatchback
- Joined: 07-November 05
View Garage
Posted 10 May 2006 - 10:14 PM
On a 202, a 173 Head will boost comp, a 186 Head will not boost compression; same as 202 Head.
#9
smeer
-
- Members
-
- 1,526 posts
Forum Fixture
- Location:Adelaide
- Car:1970 LC 4-door
- Joined: 07-November 05
Posted 11 May 2006 - 02:35 AM
Technical question slightly on topic:
How much does it cost to get bigger valves? What does it involve?
Is it machining the valve holes bigger and putting bigger valves?
My 6 has already got hardened seats, but standard valves. Will these new seats just be machined away?
How much does it cost to get bigger valves? What does it involve?
Is it machining the valve holes bigger and putting bigger valves?
My 6 has already got hardened seats, but standard valves. Will these new seats just be machined away?
#10
Dr Terry
-
- Moderators
-
- 3,278 posts
Technical + Numbers Guru + Moderator
- Location:Eastwood (Sydney) NSW
- Joined: 13-November 05
Posted 11 May 2006 - 09:57 AM
Hi Guys.
What Heath said about the heads is correct.
149, 161 & 173 heads all have the same small (45.4 cc) combustion chamber (Not counting the special order, Lo-Comp versions).
179, 186 & 202 have the same large (53.5 cc) combustion chamber.
If you put a small chambered head on a 186 block you will end up with around 10:1 compression, which , as mentioned earlier is exactly what Harry Firth did in building the XU-1 motor.
By the way Phoenix, what's a 'solid crank' ?
Dr Terry
What Heath said about the heads is correct.
149, 161 & 173 heads all have the same small (45.4 cc) combustion chamber (Not counting the special order, Lo-Comp versions).
179, 186 & 202 have the same large (53.5 cc) combustion chamber.
If you put a small chambered head on a 186 block you will end up with around 10:1 compression, which , as mentioned earlier is exactly what Harry Firth did in building the XU-1 motor.
By the way Phoenix, what's a 'solid crank' ?
Dr Terry
#11
_Keithy's_UC_
_Keithy's_UC_
-
- Guests
Posted 11 May 2006 - 11:24 AM
How about the port sizes on the 173 heads? I may be wrong here, but are they not smaller??
Keith
Keith
#12
Dr Terry
-
- Moderators
-
- 3,278 posts
Technical + Numbers Guru + Moderator
- Location:Eastwood (Sydney) NSW
- Joined: 13-November 05
Posted 11 May 2006 - 12:49 PM
Hi Keith.
To my knowledge, the standard port size for all red motors (except XU-1) is the same.
Dr Terry.
To my knowledge, the standard port size for all red motors (except XU-1) is the same.
Dr Terry.
#13
Heath
View Garage
-
- Administrators
-
- 18,319 posts
I like cars.
- Name:Heath
- Location:Eastern Suburbs, Melbourne
- Car:Heavily Modified UC Sunbird Hatchback
- Joined: 07-November 05
View Garage
Posted 11 May 2006 - 04:51 PM
^ I believe you are correct there Dr Terry, if not, maybe the 138 or something? I know nothing about that engine and considering its vastly lowered capacity it may have been built with different valve sizes. I have no idea on the chambers or anything on that head.
Smeer, I'm no engine builder but I expect you'd be getting your hardened valve seats machined out anyway (and it may actually cause some problems having the sleeve sitting in there; join problems for machining) so.
I'd say either talk to an engine builder or do the work on a standard head, get the valves way oversized and then stick sleeves in there to make them the size you want.
Smeer, I'm no engine builder but I expect you'd be getting your hardened valve seats machined out anyway (and it may actually cause some problems having the sleeve sitting in there; join problems for machining) so.
I'd say either talk to an engine builder or do the work on a standard head, get the valves way oversized and then stick sleeves in there to make them the size you want.
#14
_CHOPPER_
_CHOPPER_
-
- Guests
Posted 11 May 2006 - 06:41 PM
Apart from XU-1 engines, all Holden Red 6 heads have the same size valves.
#15
Pop's-SS
-
- Members
-
- 4,963 posts
Pops
- Name:Barry
- Location:Riverina South West Slopes
- Car:1976 Mandarin Red SS Hatchback
- Joined: 08-November 05
Posted 11 May 2006 - 08:10 PM
G'day again Phoenix
To make sure that is a 186-S motor, the prefix of the engine number should have 186S or 186K.
My ex HR 186S Premmy had the 186K prefix.
Regards............. Barry
To make sure that is a 186-S motor, the prefix of the engine number should have 186S or 186K.
My ex HR 186S Premmy had the 186K prefix.
Regards............. Barry
#16
_Phoenix_
_Phoenix_
-
- Guests
Posted 12 May 2006 - 09:39 PM
ill check the number when i pick it up from the shop on tuesday. i just sold one of the motors out the back and gave the guy my 173 head cause im gonna start looking for a 186 yella terra head. ive bought starfire rods aswell and im looking for a set of triple su's
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users
