Jump to content


Photo

6 cyl Cam Selection?


  • Please log in to reply
8 replies to this topic

#1 sr2

sr2

    Forum Participant

  • Members
  • PipPip
  • 27 posts
  • Name:Butler Simon
  • Location:New Zealand
  • Car:186 X2 Powered Rigamortice (1947)
  • Joined: 18-June 16

Posted 26 June 2020 - 04:05 PM

Hi guys, any opinions on using the attached cam specs for a 186 running a blue crank, a stage 3 Yella Terra head and triple HS6 SU's.

It's going into an old "Ratrod-ish" creation that will only be street driven.

 

Any opinions from the gurus on this site much appreciated.

 

Link to the car build thread on a NZ site.

 

https://oldschool.co...”-build-thread/

Attached Files



#2 warrenm

warrenm

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 1,905 posts
  • Location:Central West NSW
  • Car:1972 LJ Torana
  • Joined: 08-November 05
Garage View Garage

Posted 26 June 2020 - 11:55 PM

It's a pretty mild cam, I'm not  knocking it, but to give you some perspective, an LC XU-1 cam is about 218° @ .050" & the cam above is 214°. 



#3 Ice

Ice

    Cool

  • Members
  • PipPipPipPipPipPipPip
  • 13,665 posts
  • Name:Gene
  • Location:Galaxy's away from Ipswich
  • Car:77 HZ Sandman Van VF SS Ute
  • Joined: 03-January 07

Posted 27 June 2020 - 12:23 AM

With triples you maybe go just a tad bigger

#4 LC-GTR-1969

LC-GTR-1969

    Shed tinkerer

  • Members
  • PipPipPipPipPip
  • 1,142 posts
  • Location:New South Wales
  • Car:Which one?
  • Joined: 09-March 14
Garage View Garage

Posted 27 June 2020 - 03:14 PM

I agree with Warren, that is a very mild cam. It looks very much like something that a daily driver would have had in the 80s, which is great if that is what you are after, but in a rat rod type setup I would use something a little more aggressive (but that is me). 

 

With the induction and head you are using, a [email protected] cam on a 106 or 107lsa will work far better, but it will be a little crankier than the first cam you mentioned so that is personal choice as well. 

 

Do you know the compression ratio, as this will help determine the cam. 



#5 sr2

sr2

    Forum Participant

  • Members
  • PipPip
  • 27 posts
  • Name:Butler Simon
  • Location:New Zealand
  • Car:186 X2 Powered Rigamortice (1947)
  • Joined: 18-June 16

Posted 28 June 2020 - 02:24 PM

Thanks for the replies guys.

Haven't done a dummy mock up yet to confirm the compression ratio but I do know that the block and head have both been skimmed more than once.

I've made the call to use 60 Thou over dished pistons and aiming at ratio of not much more than 9.5? (The petrol in NZ is nothing to write home about!).



#6 LC-GTR-1969

LC-GTR-1969

    Shed tinkerer

  • Members
  • PipPipPipPipPip
  • 1,142 posts
  • Location:New South Wales
  • Car:Which one?
  • Joined: 09-March 14
Garage View Garage

Posted 30 June 2020 - 07:18 AM

Thanks for the replies guys.

Haven't done a dummy mock up yet to confirm the compression ratio but I do know that the block and head have both been skimmed more than once.

I've made the call to use 60 Thou over dished pistons and aiming at ratio of not much more than 9.5? (The petrol in NZ is nothing to write home about!).

 

What octane is available in NZ? With the right cam and combo, you can run a lot more compression than that on pump fuel, however as said it depends on what cam you end up using as well as what fuel is actually available. 


Edited by LC-GTR-1969, 30 June 2020 - 07:18 AM.


#7 sr2

sr2

    Forum Participant

  • Members
  • PipPip
  • 27 posts
  • Name:Butler Simon
  • Location:New Zealand
  • Car:186 X2 Powered Rigamortice (1947)
  • Joined: 18-June 16

Posted 30 June 2020 - 03:09 PM

Thanks for the interest, best pump gas in NZ is BP98.



#8 Lazarus

Lazarus

    Lazarus

  • Members
  • PipPipPipPipPipPip
  • 3,057 posts
  • Name:Mark
  • Location:Central QueensIand
  • Car:UC Sedan
  • Joined: 28-May 13

Posted Today, 07:52 AM

That cams about as big as you'd go with a single down draught Weber and as small as you'd go with triple 1 3/4 SU's.



#9 sr2

sr2

    Forum Participant

  • Members
  • PipPip
  • 27 posts
  • Name:Butler Simon
  • Location:New Zealand
  • Car:186 X2 Powered Rigamortice (1947)
  • Joined: 18-June 16

Posted Today, 08:47 PM

Thanks guys, much appreciated.

 

When the time comes for the final decision I'll dredge this thread and pick the gmh-torana brains trust one more time.

 

(You guys rock!).






1 user(s) are reading this topic

1 members, 0 guests, 0 anonymous users


    lj72bathurst