New motor 468 cui
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
New motor 468 cui
Decided to start a new thread on my engine overhaul.
Started with cam swap and developed to a complete overhaul with a 468 bore and a new crankshaft.
My engine builder told me that my crank was shot...to much axialplay.
So... it will be a completly new engine on the inside.
Straubtech has provided me with all parts and it will be a piece of art when it is finished.
Downside is i could just as well bought a new ZZ502 instead......
But now i will have a beatiful 468 and it will perform just as well thanks to Chris!
Started with cam swap and developed to a complete overhaul with a 468 bore and a new crankshaft.
My engine builder told me that my crank was shot...to much axialplay.
So... it will be a completly new engine on the inside.
Straubtech has provided me with all parts and it will be a piece of art when it is finished.
Downside is i could just as well bought a new ZZ502 instead......
But now i will have a beatiful 468 and it will perform just as well thanks to Chris!
Burning Brakes
Joined: May 2014
Posts: 1,094
Likes: 16
From: Los Angeles California
I know the feeling I got a beautiful 355 sbc all the bells n whistles chrome and aluminum everything, electric wp, at the end when I did the math I could of done an ls swap for just a tad less but or just threw in the extra 500 and built a stroker but at the time I didn't want anything to radical as I had just gotten my license back and didn't want trouble with the police now that I barely drive it, it would have been a better option as its a cruiser and not a dd anymore but I love how it came out and still fun toy now though is time to save up for a small supercharger.
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
A bit more info on my Engine build.
Scat 4340 crank.
Mahle pistons.
Eagle rods.
Morel lifters.
Comp gold rockers.
Brown Brothers springs.
Straub cam, 229/241@050, .600/.620.
New oilpump, quickfuel mechanical fuelpump, MSD probillet distributor, new harmonic balancer..+.and more...
Only stock items is engineblock, heads and valves...
All parts from Straubtech, 5400 USD+ tax and customs.
And then some shop costs....
A lot of money, but a new ZZ502 is 13000USD in Sweden...
This engine will beat a ZZ502... and the sound, do i have to say more..........
Scat 4340 crank.
Mahle pistons.
Eagle rods.
Morel lifters.
Comp gold rockers.
Brown Brothers springs.
Straub cam, 229/241@050, .600/.620.
New oilpump, quickfuel mechanical fuelpump, MSD probillet distributor, new harmonic balancer..+.and more...
Only stock items is engineblock, heads and valves...
All parts from Straubtech, 5400 USD+ tax and customs.
And then some shop costs....
A lot of money, but a new ZZ502 is 13000USD in Sweden...
This engine will beat a ZZ502... and the sound, do i have to say more..........
Last edited by clwi; Jan 11, 2016 at 01:14 PM.
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
A bit more info on my Engine build.
Scat 4340 crank.
Mahle pistons.
Eagle rods.
Morel lifters.
Comp gold rockers.
Brown Brothers springs.
Straub cam, 229/241@050, .600/.620.
New oilpump, quickfuel mechanical fuelpump, MSD probillet distributor, new harmonic balancer..+.and more...
Only stock items is engineblock, heads and valves...
All parts from Straubtech, 5400 USD+ tax and customs.
And then some shop costs....
A lot of money, but a new ZZ502 is 13000USD in Sweden...
This engine will beat a ZZ502... and the sound, do i have to say more..........
Scat 4340 crank.
Mahle pistons.
Eagle rods.
Morel lifters.
Comp gold rockers.
Brown Brothers springs.
Straub cam, 229/241@050, .600/.620.
New oilpump, quickfuel mechanical fuelpump, MSD probillet distributor, new harmonic balancer..+.and more...
Only stock items is engineblock, heads and valves...
All parts from Straubtech, 5400 USD+ tax and customs.
And then some shop costs....
A lot of money, but a new ZZ502 is 13000USD in Sweden...
This engine will beat a ZZ502... and the sound, do i have to say more..........
Jebby
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
468 Project update!
After a lot of issues and misshaps i have begun to build my engine.
Heads are rebuilt with vitonseals and new springs ready for the Straubcam.
Pistonrings filed and assembled on pistons with eagle rods.
Crank, pistons and rods are balanced.
The Scat crank was horrible out of balance!!!
Engineblock washed in acidbath and new bearings for cam, crank and rods installed.
This is when the fun begins, assembly!
After a lot of issues and misshaps i have begun to build my engine.
Heads are rebuilt with vitonseals and new springs ready for the Straubcam.
Pistonrings filed and assembled on pistons with eagle rods.
Crank, pistons and rods are balanced.
The Scat crank was horrible out of balance!!!
Engineblock washed in acidbath and new bearings for cam, crank and rods installed.
This is when the fun begins, assembly!
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Last edited by clwi; Apr 27, 2016 at 01:21 PM.
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Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
That's odd a brand new 4340 Scat crank way out of balance, these cranks should be right on the money for the price you pay. Where did you get the crank, some companies sell "blemished" or out spec cranks but they usually do tell you what is wrong with it.
Like for instance they will say the crank had to be turned 10thou. Usually to get tremove a problem with one or two main journals. Still a perfectly good crank you just use thicker bearings.
Have building the engine it is a great learning experience and a lot of fun
Like for instance they will say the crank had to be turned 10thou. Usually to get tremove a problem with one or two main journals. Still a perfectly good crank you just use thicker bearings.
Have building the engine it is a great learning experience and a lot of fun
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
That's odd a brand new 4340 Scat crank way out of balance, these cranks should be right on the money for the price you pay. Where did you get the crank, some companies sell "blemished" or out spec cranks but they usually do tell you what is wrong with it.
Like for instance they will say the crank had to be turned 10thou. Usually to get tremove a problem with one or two main journals. Still a perfectly good crank you just use thicker bearings.
Have building the engine it is a great learning experience and a lot of fun
Like for instance they will say the crank had to be turned 10thou. Usually to get tremove a problem with one or two main journals. Still a perfectly good crank you just use thicker bearings.
Have building the engine it is a great learning experience and a lot of fun
Had to take out 70grams on one side and 60grams on the other.
Guy who balanced it said it was one of the worst unbalanced cranks he had ever done.....
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
[QUOTE=rklessdriver;1592091919]Are you still using a counterweighted Flywheel and Harmonic Damper?[/QUOTE
New balanced flywheel and new harmonic balancer.
New balanced flywheel and new harmonic balancer.
Last edited by clwi; Apr 27, 2016 at 03:28 PM.
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
OK, I understand that you bought new ones.... but are they counterweighted (454) or a neutral balanced (427)?
Originally an OEM 454 BBC was designed for external balance.... Both FW and damper will have a counterweight.... this was so GM could make them easier to balance without having to re-design the crankshaft forgings to add more mass to the counterweights. The after market SCAT crank has better designed counterweights and depending on the weight of the other rotating assy parts may have been able to be balanced with a 427 style neutral balancer and FW.
Also modern aftermarket connecting rods and pistons are much lighter weight than the OEM pieces.... which mean drilling the counterweights.
These things are what most likely attributed to your new SCAT crankshaft being so heavy during balancing and needing drilling.
Will
Originally an OEM 454 BBC was designed for external balance.... Both FW and damper will have a counterweight.... this was so GM could make them easier to balance without having to re-design the crankshaft forgings to add more mass to the counterweights. The after market SCAT crank has better designed counterweights and depending on the weight of the other rotating assy parts may have been able to be balanced with a 427 style neutral balancer and FW.
Also modern aftermarket connecting rods and pistons are much lighter weight than the OEM pieces.... which mean drilling the counterweights.
These things are what most likely attributed to your new SCAT crankshaft being so heavy during balancing and needing drilling.
Will
Last edited by rklessdriver; Apr 28, 2016 at 12:34 PM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
These things are what most likely attributed to your new SCAT crankshaft being so heavy during balancing and needing drilling.
Will
Will
Bet the crank was just fine
Enjoy that BB torque, miss it sometimes. Any rpm crack the thottle and get pushed back in the seat
Last edited by cv67; Apr 28, 2016 at 12:39 PM.
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
OK, I understand that you bought new ones.... but are they counterweighted (454) or a neutral balanced (427)?
Originally an OEM 454 BBC was designed for external balance.... Both FW and damper will have a counterweight.... this was so GM could make them easier to balance without having to re-design the crankshaft forgings to add more mass to the counterweights. The after market SCAT crank has better designed counterweights and depending on the weight of the other rotating assy parts may have been able to be balanced with a 427 style neutral balancer and FW.
Also modern aftermarket connecting rods and pistons are much lighter weight than the OEM pieces.... which mean drilling the counterweights.
These things are what most likely attributed to your new SCAT crankshaft being so heavy during balancing and needing drilling.
Will
Originally an OEM 454 BBC was designed for external balance.... Both FW and damper will have a counterweight.... this was so GM could make them easier to balance without having to re-design the crankshaft forgings to add more mass to the counterweights. The after market SCAT crank has better designed counterweights and depending on the weight of the other rotating assy parts may have been able to be balanced with a 427 style neutral balancer and FW.
Also modern aftermarket connecting rods and pistons are much lighter weight than the OEM pieces.... which mean drilling the counterweights.
These things are what most likely attributed to your new SCAT crankshaft being so heavy during balancing and needing drilling.
Will
To make a long story short.
Everything was balanced when we discovered that i had got the wrong pistons, Chris sent new ones and we had to rebalance it and add some weight to flywheel to get it right.
Dont ask me why and how, i am a newbee on this.
Crank, cam and camgear in place, next pistons and rod install.
This is my first enginebuild and doing it myself, with a little assist from my mechanic, great fun!!
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Le Mans Master
Joined: Jan 2006
Posts: 6,506
Likes: 139
From: Butler Pa
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Nice job, first one too
Wait til you hear it fire up for the first time, something satisfying about knowing your two hands did it....theres nothing like the smell of a new motor when the paint strts warming up a bit, better than brownies out of the oven!
Get some video of it
Wait til you hear it fire up for the first time, something satisfying about knowing your two hands did it....theres nothing like the smell of a new motor when the paint strts warming up a bit, better than brownies out of the oven!
Get some video of it