| [ Total Views: 795 | Total Replies: 7 | Thread Id: 4518 ] |
|
|
 kafer70
Posts:
Threads:
Registered: January 1st, 1970
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
|
| posted on March 18th, 2003 at 08:40 PM |
|
|
CW Crank 1916
I am currently in the (lengthy) process of building a 1916.
I don't plan on revving the ring out of it so do I need to think about a cw crank ?.
Although I would like to give it a run down the qtr. mile on the odd occasion
Any other hints or tips would be great.
Cheers |
|
|
56astro
Custom Title Time!
Posts: 1772
Threads: 74
Registered: August 25th, 2002
Member Is Offline
Location: The Nambucca
Theme: UltimaBB Pro Blue ( Default )
Mood: Pobjoy Powered with twin ignition & soon to be EFI'd
|
| posted on March 18th, 2003 at 09:05 PM |
|
|
I'd go the CW route.
I think you'd be sorry if you went the other way, especially when ya want to give the rice burners a scare.
I think most would not recommend reving a non-cw crank past about 4500 rpm, even occasionaly.
VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa |
|
|
Quickbug
Officially Full-On Dubber
Posts: 363
Threads: 16
Registered: September 24th, 2002
Member Is Offline
Location: Roselands NSW
Theme: UltimaBB Pro Blue ( Default )
Mood: Plucked...
|
| posted on March 18th, 2003 at 09:53 PM |
|
|
Definately a good idea to go cw.
It makes the car more drivable even if you dont intend thrashing it much.
For a few extra bucks why not?
|
|
|
 Bizarre
Super Moderator
The artist formerly known as blue74l
Posts: 12780
Threads: 734
Registered: August 25th, 2002
Member Is Offline
Location: Abbotsford, Sydney
Theme: UltimaBB Pro Blue ( Default )
|
| posted on March 19th, 2003 at 09:24 AM |
|
|
Yep CW it!
1776 with balanced bottom end may be but a 1916...well....
On top of that what would you do otherwise?
A re-fround stock crank..... i dont think so....a new stock crank. Why bother.
Give a few shops a call - should be able to pick one up fairly cheap
Futue te ipsum!!!
|
|
|
Mr Hoodjacks
Casual Dubber
Posts: 27
Threads: 2
Registered: February 27th, 2003
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
Mood: I'm cool..
|
| posted on March 21st, 2003 at 09:19 PM |
|
|
Yeah, go the C/W crank. It's only a few extra $$. That way if you want to go silly with heads and EFI later, you won't have to split the
case... Although someone I know did a season or two in hillclimbs, drags and scared HSVs stupid on the street with a stock non c/w crank! Got buzzed
to 6200 everytime it was driven
|
|
|
70AutoStik
Insano Dub Head
Posts: 730
Threads: 18
Registered: August 30th, 2002
Member Is Offline
Location: Dandenong. Victoria
Theme: UltimaBB Pro Blue ( Default )
|
| posted on March 21st, 2003 at 10:04 PM |
|
|
Have to agree with 56astro; revving past 4500 on a regular basis will shorten the life of your engine, remember that you are swinging a little more
weight with 94mm pistons. Many builders would recommend the CW crank on such an engine simply because it will help to maintain oil pressure (as the
stock crank flexes at higher revs it allows a little more oil to get past the bearings - this problem increasing as the flex wears the bearings.)
|
|
|
whatnow
A.k.a.: Henry
Custom Title Time!
Posts: 1000
Threads: 54
Registered: January 11th, 2003
Member Is Offline
Location: armidale, northern tablelands NSW
Theme: UltimaBB Streamlined2
Mood: 14's are the new earlies.
|
| posted on March 22nd, 2003 at 04:26 AM |
|
|
kafer i'd say go for a CW crank, though i'm bais for the manifacturer of the above mentioned crank. still go for the CW crank for your sake
in the future.
mr hoodjacks... are you still heading too the "dale" in the near future, if so call me. hans has buggered off to work in WA so no plugs
needed for his buisness. if you are heading north soon please give me a call.
h.
|
|
|
Che Castro
Custom Title Time!
ankle straps
Posts: 1945
Threads: 79
Registered: August 25th, 2002
Member Is Offline
Location: Sydney, Australia
Theme: UltimaBB Pro Blue ( Default )
Mood: (( }:-{D]
|
| posted on March 23rd, 2003 at 12:35 PM |
|
|
yeah look at the design of the crank, it has two rod bearing journals side by side and only 2 main bearings each side to support both of them.
look at a subaru flat 4 crank, it has a main bearing journal between each rod journal, less flex and its CW from the factory.
CW is great, less flexing, less pounding out the case, less energy wasted in vibration.
Jon
|
|
|
jboy82
Seriously Crusin Dubber
Posts: 105
Threads: 7
Registered: February 1st, 2003
Member Is Offline
Location: Adelaide
Theme: UltimaBB Pro Blue ( Default )
Mood: I find that highly irrelevant.
|
| posted on March 23rd, 2003 at 12:42 PM |
|
|
Hey guys,
How many RPM do you think 1916 with CW crank, 110 cam, mildly polished head + progressive dellorto could rev out to?
I was considering buying newly built one that was for sale for $2500! a while ago but the owner changed his mind.
I've been looking for a bargain like that to come along ever since
Cheers,
Josh
|
|
|
Bizarre
Super Moderator
The artist formerly known as blue74l
Posts: 12780
Threads: 734
Registered: August 25th, 2002
Member Is Offline
Location: Abbotsford, Sydney
Theme: UltimaBB Pro Blue ( Default )
|
| posted on March 23rd, 2003 at 04:44 PM |
|
|
| Quote: | Originally
posted by jboy82
+ progressive dellorto
|
Dellortos are non progressive like an IDF.
Is this a single DRLA that you are talking about?
Anyway i would say 5-6000 revs
Futue te ipsum!!!
|
|
|
Craig Torrens
A.k.a.: Craig Torrens
Scirocco Rare
6 times Australian, 7 times State Hillclimb Class Champion
Posts: 8040
Threads: 347
Registered: January 10th, 2003
Member Is Offline
Location: Sydney
Theme: UltimaBB Pro Blue ( Default )
Mood: Time to go Salt lake racing, and actually achieve a result.
|
| posted on April 15th, 2003 at 09:27 PM |
|
|
If you are only using a 110 cam then save your money and use a stock crank. This is a mild cam with power at about 5k, not much use revving past this
. Stock cranks will not flex below 6/6500, the main problem with engine life is poor line boring of the cases, and then people blame the crank ! Make
sure everything is balanced and that the crank is crack tested before fitting.
|
|
|
Bug_racer
Officially Full-On Dubber
Posts: 351
Threads: 16
Registered: September 7th, 2002
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
|
| posted on April 18th, 2003 at 12:54 PM |
|
|
Crank
It also depends on heads too . I had a 1916 with counterweight crank , 042 Heads 40 x 35.5 valves , single Berg springs , chromoly pushrods 9.5 :1
compression and it made peak power around 5500 rpm and revved to around 6800 . Also used dual 40 IDF's . Originally had a 45 Dellorto , duals
make a big difference
|
|
|
.JPG "Avatar")
