• The Roadster Factory Recovery Fund - Friends, as you may have heard, The Roadster Factory, a respected British Car Parts business in PA, suffered a total loss in a fire on Christmas Day. Read about it, discuss or ask questions >> HERE. The Triumph Register of America is sponsoring a fund raiser to help TRF get back on their feet. If you can help, vist >> their GoFundMe page.
  • Hey there Guest!
    If you enjoy BCF and find our forum a useful resource, if you appreciate not having ads pop up all over the place and you want to ensure we can stay online - Please consider supporting with an "optional" low-cost annual subscription.
    **Upgrade Now**
    (PS: Subscribers don't see this UGLY banner)
Tips
Tips

kings crankshaft?

Brosky

Great Pumpkin
Offline
Never heard of them. Are they stateside? Amy idea of the location so we can check them out for you?
 
OP
cjm

cjm

Jedi Trainee
Offline
hi hondo402000,am e-mailing about getting prices and spec info for a billet crank,have been quoted £2800 plus vat from tr enterprises,here in uk,kings crankshaft $2950,but abit of a wait,just had quote from prirace,$3000,waiting to hear spec.kings use 4340 aq timken.thanks for reply,any help or advice greatly appriciated.
 

trfourtune

Jedi Knight
Offline
cjm,
is that the old style steel crank, the new racetorations style with the dummy jornals, or a different actual ,machined from, billet crank?
rob
 

jsneddon

Jedi Knight
Country flag
Offline

Alan_Myers

Luke Skywalker
Offline
Hi,

I'm not familiar with King crankshafts. The name I hear most often associated with crankshafts in the U.S. is Moldex.

If I understand correctly, the 6-cyl. basically benefits from going to a more rigid crank. The stock TR6 crank is too floppy and that's why they shake off the flywheel/clutch when revved. (GT6 crank, interestingly, is said to be made of much sterner stuff.)

For the 4-cyl. motor especially, the "low inertia" style at www.racetoration.co.uk looks very interesting! That's the one Rob is asking about. It should make the motor spin up very quickly, and if well made might really help that engine's harmonics. I've heard some good things about it on this engine (but always would be interested to hear more)!

I haven't read or seen anything about the same design in the 6-cyl. version. Anyone?

/ubbthreads/images/graemlins/cheers.gif
 

swift6

Yoda
Offline
[ QUOTE ]
If I understand correctly, the 6-cyl. basically benefits from going to a more rigid crank. The stock TR6 crank is too floppy and that's why they shake off the flywheel/clutch when revved. (GT6 crank, interestingly, is said to be made of much sterner stuff.)

[/ QUOTE ]

I seriously doubt they were made from different material. I think the real difference between the 2.0 vs. 2.5 crank comes in the larger throws/offsets required of the 2.5 displacement. Remember that the 2.5 is a stroked 2.0. That and only 4 main bearings on a crank that long. The shorter throws of the 2.0 crank would mean less inertia and less flex and would therefore lead to higher revs with longer life. Which could lead to the opinion that the cranks were better made when they weren't. There are just differences in intent in the designs that require different solutions to work past.

/ubbthreads/images/graemlins/cheers.gif
 

hondo402000

Darth Vader
Offline
PRI****** danger danger, If you deal with this person get everything in writting, warranty, return policy, and when he plans on delivering I have had issues with this guy and his so called life time support, bull mudpies
 

MDCanaday

Jedi Knight
Offline
My nickel on this is if you are a SERIOUS racer you might get some benefit from a billet.I can tell you that I have seen billets break from design/quality problems. So for my money I like the OE crank lightened and deep nitrited. I tested my tr4 to 7000 on the dyno,we backed off when the generator blew.....of course you must lighten up the recipricating mass considerably to avoid over loading the crank.....and make big HP.
MD(mad dog)
 
OP
cjm

cjm

Jedi Trainee
Offline
hi mdcanaday, see your point,nitrided gives about 50 percent extra hardness,for about £200,good value,although i have been informed that plasma nitriding is better.supposedly the top companies who design cranks use computer programs to aid design,and the choice of company becomes critical?
 
Similar threads
Thread starter Title Forum Replies Date
B TR6 Crankshaft long seal surface Triumph 5
MKIII_Joey Crankshaft Bearing Austin Healey 7
BT7 Owner Rear Crankshaft Bearing Cap Austin Healey 4
K TR2/3/3A " do not remove the fan as it is essential for establishing crankshaft balance" Triumph 9
B General MG Crankshaft Nut Removal MG 4
W Crankshaft Oil Seal Austin Healey 3
Popeye TR4/4A Crankshaft pulley recommendations: One piece alloy, two-piece steel, wide, narrow...? Triumph 12
B MGB Mgb crankshaft end play shims MG 2
M TR2/3/3A 1958 TR 3 , crankshaft nut for hand starting Triumph 7
M TR2/3/3A Crankshaft Sludge Plug Removal Triumph 6
T crankshaft (rear) bearing leak Spridgets 2
T Wanted Wanted - 1956 TR3 Crankshaft Triumph Classifieds 0
R Wanted 3 main crankshaft MG Classifieds 0
glemon TR2/3/3A Crankshaft Question Triumph 3
J Crankshaft dog nut and timing chain cover removal advice Austin Healey 30
AUSMHLY Crankshaft Starter Nut Austin Healey 10
S For Sale Mg t-series crankshaft tb tc td tf 1250 1500 MG Classifieds 0
K TR2/3/3A Anyone have a picture of the crankshaft pulley.... Triumph 1
S Wanted Looking for a new/used crankshaft for a 100-4 Austin Healey Classifieds 0
P TR2/3/3A Crankshaft Thrust Washers Triumph 4
M TR2/3/3A Crankshaft Pulley Configurations Triumph 3
M TR2/3/3A Crankshaft Oil Galley Plugs Triumph 7
S TR4/4A Fair price for a crankshaft? Triumph 2
charleyf TR2/3/3A crankshaft hardening Triumph 2
Gerard Wanted: 1275 Crankshaft Spridgets 3
T can't find timing marks on 1275 crankshaft pulley/damper Spridgets 8
G Crankshaft Rotational Freeplay - What's going on with this engine? Austin Healey 12
O Wanted TR 3 Crankshaft please... Triumph Classifieds 1
P Replacing the crankshaft damper [harmonic balancer] Austin Healey 15
GTP1960 TR2/3/3A Moss Crankshaft pulley failure Triumph 23
C Tough Bolt on front of Crankshaft Spridgets 16
TRMark TR4/4A Prepping Crankshaft Triumph 4
D TR2/3/3A crankshaft shims to align timing sprovkets Triumph 4
KVH General Tech Crankshaft Main Bearing and Oversize Puzzle Triumph 5
tinman58 TR5/TR250 Front crankshaft seal Triumph 0
2billydavies TR2/3/3A removing con rod from crankshaft Triumph 4
J TR2/3/3A Crankshaft thrust washers. Triumph 2
C Crankshaft pulley / damper Austin Healey 5
HJR TR2/3/3A Crankshaft crank bolt head[108498] Triumph 10
M For 1974 MG Midget - Crankshaft pulley bolt is 1 5/16"? Spridgets 4
M Spitfire need a crankshaft pulley for 1978 Spitfire Triumph 0
M_Pied_Lourd TR2/3/3A TR3A Crankshaft Question Triumph 3
B crankshaft/cam timing Austin Healey 10
RedTR3 TR2/3/3A TR3 Crankshaft Options Triumph 10
Gerard 1098 10CC crankshaft Spridgets 14
vette Timing Cover crankshaft pulley seal Austin Healey 6
AHS TR2/3/3A Which way does the TR3 front crankshaft oil seal face? Triumph 8
M Healey Crankshaft Thrust Washer Thickness Austin Healey 3
Tugboat Crankshaft Pulley Question Triumph 4
J How bad do Spridgets leak oil from the crankshaft? Spridgets 18

Similar threads

Top