Jump to content


Photo

crane cam


  • Please log in to reply
18 replies to this topic

#1 lawn bowls

lawn bowls

    Forum Member

  • Members
  • PipPipPip
  • 206 posts
  • Location:queensland
  • Car:72 lj 4 door
  • Joined: 17-March 17

Posted 20 October 2019 - 10:49 PM

a friend raced the vr ute at the drags for the first time 355 750 double pumper harrop manifold the cam is a crane h286 its got a turbo 400 3000 hi stall convertor 4.11 borg warner 28/10/16 slicks it only revs to 5500-5600 the car ran out of cam about 30 metres before the finish line went 11.9 at 111 mph,with this cam and 28 inch tall tyres 4.11 should it be at max revs about 30 metres before the finish line



#2 Shiney005

Shiney005

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 4,977 posts
  • Name:Laurie
  • Location:Dubya Hay
  • Car:Toyota Mirai
  • Joined: 19-January 12
Garage View Garage

Posted 21 October 2019 - 09:55 AM

I don't know, but I would have thought the 286 Crane would rev past five and a half grand. I had a Crane 292 in a 308 once and it used to rev all the way to valve float.



#3 Redslur

Redslur

    Has been Torana owner

  • Members
  • PipPipPipPipPipPip
  • 3,181 posts
  • Name:Gerry
  • Location:Canberra
  • Car:VP 5.0L Berlina, VZ CV8 Monaro
  • Joined: 08-November 05

Posted 21 October 2019 - 11:15 AM

Agree you need a bigger cam with 4:11's to power over the line. I had a 355 pulling 7k over the line with 4:11s.



#4 RedTaxi

RedTaxi

    Forum Participant

  • Members
  • PipPip
  • 13 posts
  • Name:Glen
  • Location:NZ
  • Car:LX hatch
  • Joined: 16-July 19

Posted 21 October 2019 - 11:19 AM

A stock 308 revs that far. Single or dual plane Harrop? Compression, Head work? 11.9 is still pretty good for those revs.



#5 UC308Hatch

UC308Hatch

    Forum Member

  • Members
  • PipPipPip
  • 114 posts
  • Name:Ron McNab
  • Location:Tas
  • Car:UC Torana Hatch
  • Joined: 07-April 12

Posted 21 October 2019 - 11:24 AM

Your rpm & speed match the calculations for your tyre size8deea0623655d7cbb3c8a0becbe2d9b4.jpg

But according to the advertised cam specs, you should have more rpm up you sleeve47d44d61af40f39e680161ff5985ea86.jpg


Sent from my iPhone using Tapatalk

#6 UC308Hatch

UC308Hatch

    Forum Member

  • Members
  • PipPipPip
  • 114 posts
  • Name:Ron McNab
  • Location:Tas
  • Car:UC Torana Hatch
  • Joined: 07-April 12

Posted 21 October 2019 - 11:27 AM

Sorry that’s not real clear - it says 6200rpm

#7 UC308Hatch

UC308Hatch

    Forum Member

  • Members
  • PipPipPip
  • 114 posts
  • Name:Ron McNab
  • Location:Tas
  • Car:UC Torana Hatch
  • Joined: 07-April 12

Posted 21 October 2019 - 11:30 AM

Being a 355 it probably drops the rpm down by 500rpm to 6700, maybe that’s all you get with that cam......

#8 UC308Hatch

UC308Hatch

    Forum Member

  • Members
  • PipPipPip
  • 114 posts
  • Name:Ron McNab
  • Location:Tas
  • Car:UC Torana Hatch
  • Joined: 07-April 12

Posted 21 October 2019 - 11:36 AM

Sorry wish I knew how to edit, 5700rpm

#9 yel327

yel327

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 8,307 posts
  • Joined: 10-February 08

Posted 21 October 2019 - 12:33 PM

Just look at a similar grind for a SBC and compare the rev range for a 302 and a 350 and you’ll get the answer. 4” bore with 3.48” stroke (350) or 3.75” stroke (377) don’t want or need to rev as hard as a 3” (or thereabouts) stroke.

#10 Shiney005

Shiney005

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 4,977 posts
  • Name:Laurie
  • Location:Dubya Hay
  • Car:Toyota Mirai
  • Joined: 19-January 12
Garage View Garage

Posted 21 October 2019 - 12:37 PM

I never thought of that, but makes perfect sense.



#11 lawn bowls

lawn bowls

    Forum Member

  • Members
  • PipPipPip
  • 206 posts
  • Location:queensland
  • Car:72 lj 4 door
  • Joined: 17-March 17

Posted 21 October 2019 - 03:17 PM

it has about .490 lift it sounds resonbly healthy cam with open exhaust 



#12 Shiney005

Shiney005

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 4,977 posts
  • Name:Laurie
  • Location:Dubya Hay
  • Car:Toyota Mirai
  • Joined: 19-January 12
Garage View Garage

Posted 22 October 2019 - 08:32 AM

Timing?



#13 gtrboyy

gtrboyy

    Lotsa Posts!

  • Members
  • PipPipPipPipPipPip
  • 2,839 posts
  • Location:SYDNEY,NSW
  • Joined: 07-November 05

Posted 22 October 2019 - 07:48 PM

I'd be expecting it to atleast go 6-6500rpm with that cam/manifold/carb also be wondering if it's starving fuel up top or hei ignition not up to snuff...2 things found quickly holding back my vh sle with f280/355 4500 stally 4.5 gears etc



#14 Redslur

Redslur

    Has been Torana owner

  • Members
  • PipPipPipPipPipPip
  • 3,181 posts
  • Name:Gerry
  • Location:Canberra
  • Car:VP 5.0L Berlina, VZ CV8 Monaro
  • Joined: 08-November 05

Posted 23 October 2019 - 11:24 AM

It might rev to 6-6500 but would not have any power there. The H286 at best powers to about 5800rpm with my dyno experiences. I swapped out the 286 for a 304.  A much better cam and good performance up to around 6000rpm.

 

If your car isn't revving past 5500-5600rpm you have other problems like fuel starvation or spark issues. A 286 will go well over 6000rpm but as stated, rolls over powerwise well before then,



#15 gtrboyy

gtrboyy

    Lotsa Posts!

  • Members
  • PipPipPipPipPipPip
  • 2,839 posts
  • Location:SYDNEY,NSW
  • Joined: 07-November 05

Posted 23 October 2019 - 03:32 PM

Also check voltage 85amp alternator is enough for streetcar but something bigger like 120a or ls 140a alternators



#16 lawn bowls

lawn bowls

    Forum Member

  • Members
  • PipPipPip
  • 206 posts
  • Location:queensland
  • Car:72 lj 4 door
  • Joined: 17-March 17

Posted 23 October 2019 - 06:13 PM

It might rev to 6-6500 but would not have any power there. The H286 at best powers to about 5800rpm with my dyno experiences. I swapped out the 286 for a 304. A much better cam and good performance up to around 6000rpm.

If your car isn't revving past 5500-5600rpm you have other problems like fuel starvation or spark issues. A 286 will go well over 6000rpm but as stated, rolls over powerwise well before then,

crane cams say I think it will rev to 6000 rpm with 308 but rev to 5500 with 355


Sent from my iPhone using Tapatalk

#17 yel327

yel327

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 8,307 posts
  • Joined: 10-February 08

Posted 23 October 2019 - 06:24 PM

I think they mean make power until 5500rpm, not rev to 5500rpm.

#18 lawn bowls

lawn bowls

    Forum Member

  • Members
  • PipPipPip
  • 206 posts
  • Location:queensland
  • Car:72 lj 4 door
  • Joined: 17-March 17

Posted 23 October 2019 - 06:33 PM

I think they mean make power until 5500rpm, not rev to 5500rpm.

most probably


Sent from my iPhone using Tapatalk

I think they mean make power until 5500rpm, not rev to 5500rpm.

getting a aspirated v8 to run 11s and reving to 5500 rpm is good


Sent from my iPhone using Tapatalk

#19 ozyozyozy

ozyozyozy

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 840 posts
  • Location:perth
  • Joined: 13-February 08

Posted 23 October 2019 - 10:09 PM

Good no’s at the drags.
With those cam specs i would be surprised if it reved much harder in a 355.
Could try 3.9 gears, to give it more legs.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users