The Cal-look Lounge
Welcome,
Guest
. Please
login
or
register
.
Did you miss your
activation email?
November 13, 2024, 07:38:08 am
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
Thank you for your support!
Search:
Advanced search
351179
Posts in
28652
Topics by
6853
Members
Latest Member:
Hacksaw Racing
The Cal-look Lounge
Cal-look/High Performance
Technical stuff
Crank with Type 1 main or Type 4 main?
« previous
next »
Pages:
[
1
]
Author
Topic: Crank with Type 1 main or Type 4 main? (Read 6804 times)
runningmonkey
Jr. Member
Posts: 85
Crank with Type 1 main or Type 4 main?
«
on:
August 08, 2017, 13:12:28 pm »
Hi all
Am building a 2332 which am going to turbo and EFI (using CB performance kit)
Iv just bought a 84mm Scat Crank with type 1 mains, but Iv been told what I really should have bought is a crank with a type 4 main bearing?
Could someone please tell what the benefits are of using the type 4 bearing? and am I still going to be ok with my type 1 bearing crank?
Cheers in advance John
Logged
UltraOrange67-2443
Hero Member
Posts: 1034
Re: Crank with Type 1 main or Type 4 main?
«
Reply #1 on:
August 08, 2017, 18:17:54 pm »
Hi John
T4 mains are stronger.
Sometimes they run a T4 center main.
The Crank can flex at high RPM.
What Crank have you got?
Maybe sell it and get something better, I like Scat Cranks.
Cheers, Nick
Logged
1967 1200 2920cc EFI
Tufty65
Full Member
Posts: 118
Re: Crank with Type 1 main or Type 4 main?
«
Reply #2 on:
August 08, 2017, 22:21:56 pm »
Quote from: runningmonkey on August 08, 2017, 13:12:28 pm
Hi all
Am building a 2332 which am going to turbo and EFI (using CB performance kit)
Iv just bought a 84mm Scat Crank with type 1 mains, but Iv been told what I really should have bought is a crank with a type 4 main bearing?
Could someone please tell what the benefits are of using the type 4 bearing? and am I still going to be ok with my type 1 bearing crank?
Cheers in advance John
The simple benefit is strength.
I used a type 1 main crank on a 2332 cb turbo motor and it held up for quite a few years but I had the crank assembly dynamically balanced too,all the pistons and rods matched, it will be ok but will undoubtedly flex more than a t4 main crank will at high rpm.
If your case is a t1 mains bore you could use a t4 centre main crank and use the BMW conversion bearing so it will fit on your case without machine work.
The strongest cranks out there use all t4 mains and bigger but cost more.
Logged
Outlaw Flat Four 35
12.64 @ 106.25mph
richie
Hero Member
Posts: 5687
Re: Crank with Type 1 main or Type 4 main?
«
Reply #3 on:
August 09, 2017, 09:01:10 am »
Hi John
the actual difference is type 4 mains being bigger size means crank has more overlap material between main journals and rod journals which makes crank stronger and less prone to flex. All type 4 mains creates a lot of other problems for case work though, type 4 center main only is not to bad to do mods to case.
Here's some real world experience, not just internet stories
I personally have a Scat 84mm type 1 mains crank I ran in Old cabrio for 8 years, starting as a N/A engine, then Nitrous engine, finally turbo engine and went as quick as 9.66 with, I then sold it and it went into another turbo car, was then sold and went into another turbo car and is still running today 17 years on
, its never even been reground, just been polished once so yes it can work without type 4 mains
Its all about the tune & set up, even with type 4 mains if its done wrong it will still break!!!!
cheers Richie
Logged
Cars are supposed to be driven, not just talked about!!!
Good parts might be expensive but good advice is priceless
leec
Hero Member
Posts: 2599
Re: Crank with Type 1 main or Type 4 main?
«
Reply #4 on:
August 09, 2017, 09:55:13 am »
That's a great value crank there
Logged
bedjo78
Sr. Member
Posts: 253
Re: Crank with Type 1 main or Type 4 main?
«
Reply #5 on:
August 10, 2017, 04:03:10 am »
Hi Richie
was the crankshaft wedgemated ?
Logged
runningmonkey
Jr. Member
Posts: 85
Re: Crank with Type 1 main or Type 4 main?
«
Reply #6 on:
August 10, 2017, 13:39:20 pm »
Quote from: richie on August 09, 2017, 09:01:10 am
Hi John
the actual difference is type 4 mains being bigger size means crank has more overlap material between main journals and rod journals which makes crank stronger and less prone to flex. All type 4 mains creates a lot of other problems for case work though, type 4 center main only is not to bad to do mods to case.
Here's some real world experience, not just internet stories
I personally have a Scat 84mm type 1 mains crank I ran in Old cabrio for 8 years, starting as a N/A engine, then Nitrous engine, finally turbo engine and went as quick as 9.66 with, I then sold it and it went into another turbo car, was then sold and went into another turbo car and is still running today 17 years on
, its never even been reground, just been polished once so yes it can work without type 4 mains
Its all about the tune & set up, even with type 4 mains if its done wrong it will still break!!!!
cheers Richie
Thanks Richie! That's put my mine at ease! Many thanks!
Logged
Andy
Full Member
Posts: 159
Re: Crank with Type 1 main or Type 4 main?
«
Reply #7 on:
August 10, 2017, 14:38:27 pm »
Quote from: richie on August 09, 2017, 09:01:10 am
Here's some real world experience, not just internet stories
I personally have a Scat 84mm type 1 mains crank I ran in Old cabrio for 8 years, starting as a N/A engine, then Nitrous engine, finally turbo engine and went as quick as 9.66 with, I then sold it and it went into another turbo car, was then sold and went into another turbo car and is still running today 17 years on
, its never even been reground, just been polished once so yes it can work without type 4 mains
Its all about the tune & set up, even with type 4 mains if its done wrong it will still break!!!!
cheers Richie
Was that a Chevy journal crank.
I am in the middle of trying to to choose a crank for a new engine , either 2276 or 2332, for Strip and Street use. 😉
Cheers Andy.
Logged
richie
Hero Member
Posts: 5687
Re: Crank with Type 1 main or Type 4 main?
«
Reply #8 on:
August 10, 2017, 19:14:58 pm »
Quote from: bedjo78 on August 10, 2017, 04:03:10 am
Hi Richie
was the crankshaft wedgemated ?
Later on in its life it was when turboed it was yes
Logged
Cars are supposed to be driven, not just talked about!!!
Good parts might be expensive but good advice is priceless
SSRT
Newbie
Posts: 19
Re: Crank with Type 1 main or Type 4 main?
«
Reply #9 on:
August 10, 2017, 22:20:42 pm »
Quote from: richie on August 09, 2017, 09:01:10 am
Hi John
the actual difference is type 4 mains being bigger size means crank has more overlap material between main journals and rod journals which makes crank stronger and less prone to flex. All type 4 mains creates a lot of other problems for case work though, type 4 center main only is not to bad to do mods to case.
Here's some real world experience, not just internet stories
I personally have a Scat 84mm type 1 mains crank I ran in Old cabrio for 8 years, starting as a N/A engine, then Nitrous engine, finally turbo engine and went as quick as 9.66 with, I then sold it and it went into another turbo car, was then sold and went into another turbo car and is still running today 17 years on
, its never even been reground, just been polished once so yes it can work without type 4 mains
Its all about the tune & set up, even with type 4 mains if its done wrong it will still break!!!!
cheers Richie
Magnesium case or alu?
Logged
bedjo78
Sr. Member
Posts: 253
Re: Crank with Type 1 main or Type 4 main?
«
Reply #10 on:
August 10, 2017, 23:20:00 pm »
[/quote]
Later on in its life it was when turboed it was yes
[/quote]
thanks .. for good information you passed as always
Logged
richie
Hero Member
Posts: 5687
Re: Crank with Type 1 main or Type 4 main?
«
Reply #11 on:
August 11, 2017, 07:06:05 am »
Quote from: SSRT on August 10, 2017, 22:20:42 pm
Quote from: richie on August 09, 2017, 09:01:10 am
Hi John
the actual difference is type 4 mains being bigger size means crank has more overlap material between main journals and rod journals which makes crank stronger and less prone to flex. All type 4 mains creates a lot of other problems for case work though, type 4 center main only is not to bad to do mods to case.
Here's some real world experience, not just internet stories
I personally have a Scat 84mm type 1 mains crank I ran in Old cabrio for 8 years, starting as a N/A engine, then Nitrous engine, finally turbo engine and went as quick as 9.66 with, I then sold it and it went into another turbo car, was then sold and went into another turbo car and is still running today 17 years on
, its never even been reground, just been polished once so yes it can work without type 4 mains
Its all about the tune & set up, even with type 4 mains if its done wrong it will still break!!!!
cheers Richie
Magnesium case or alu?
Mag case when N/A and nitrous, then ally for turbo
cheers Richie
Logged
Cars are supposed to be driven, not just talked about!!!
Good parts might be expensive but good advice is priceless
richie
Hero Member
Posts: 5687
Re: Crank with Type 1 main or Type 4 main?
«
Reply #12 on:
August 11, 2017, 07:06:28 am »
Quote from: bedjo78 on August 10, 2017, 23:20:00 pm
Later on in its life it was when turboed it was yes
[/quote]
thanks .. for good information you passed as always
[/quote]
No problem
Logged
Cars are supposed to be driven, not just talked about!!!
Good parts might be expensive but good advice is priceless
Fastbrit
Hero Member
Posts: 4731
Keep smiling...
Re: Crank with Type 1 main or Type 4 main?
«
Reply #13 on:
August 11, 2017, 08:21:04 am »
Some more real world experience. Ran a welded 78mm stroker from Pauter, all VW journals, turbo and turbo with 50 shot nitrous, for five seasons (one in Flat Attack, four in No Mercy). Engine sold to Ken Blomer and then to Natashia Garcia for use in their cars. Crank never needed grinding, or straightening. Magnesium cases only.
OK, not a long stroke by today's standards, but if everything is carefully balanced, it's amazing how long old shit can last. T4 main bearing conversion was around at the time but all the related hassle never seemed to make it worth it, and I had no evidence it was needed in my situation...
Logged
Der Kleiner Panzers VW Club
12.56sec street-driven Cal Looker in 1995
9.87sec No Mercy race car in 1994
Seems like a lifetime ago...
Pages:
[
1
]
« previous
next »
Jump to:
Please select a destination:
-----------------------------
Cal-look/High Performance
-----------------------------
=> Cal-look
=> Pure racing
=> Technical stuff
=> Top Racers lists
=> In Da Werks
-----------------------------
The Cal-look classifieds
-----------------------------
=> For sale!
=> Wanted
-----------------------------
Happenings
-----------------------------
=> Happenings
=> Scandinavian Cal-look Classic (the event)
-----------------------------
Tyre kicking
-----------------------------
=> Off Topic
Loading...