LT1 vs LT4 External Balance
12-18-2005, 12:45 PM
#1
Safety Car
Thread Starter
LT1 vs LT4 External Balance
Is the LT1 and LT4 balanced the same? IE would an LT1 flexplate work with a stock LT4? Same question for balancers.
12-18-2005, 01:53 PM
#2
Melting Slicks
Originally Posted by Mr Dave
Is the LT1 and LT4 balanced the same? IE would an LT1 flexplate work with a stock LT4? Same question for balancers.
12-19-2005, 08:44 PM
#3
Pro
Hey dave ..I don't know the answer to your question..but, check with me around the beginning of February...because I ordered an lt4 for my a4 vette, and will be taking my flexplate, and swapping out the flywheel on the lt4 before I put it back in. You'll find a lot of ambiguity depending on the different boards. Try impalassforum.com and camaroz28.com. there seem to be more gearheads over on those forums. If you get a definitive answer, please do let me know.
prozac, is there actually an internal balancer or are you talking about the internals being balanced or are you referring to the harmonic balancer. I too am confused on this issue..despite all the help everyone has offered.
prozac, is there actually an internal balancer or are you talking about the internals being balanced or are you referring to the harmonic balancer. I too am confused on this issue..despite all the help everyone has offered.
12-19-2005, 09:00 PM
#4
Le Mans Master
Member Since: Dec 2004
Location: Myrtle Beach SC
Posts: 5,789
Likes: 0
Received 7 Likes
on
6 Posts
St. Jude Donor '05-'06
Originally Posted by torchred96
Hey dave ..I don't know the answer to your question..but, check with me around the beginning of February...because I ordered an lt4 for my a4 vette, and will be taking my flexplate, and swapping out the flywheel on the lt4 before I put it back in. You'll find a lot of ambiguity depending on the different boards. Try impalassforum.com and camaroz28.com. there seem to be more gearheads over on those forums. If you get a definitive answer, please do let me know.
prozac, is there actually an internal balancer or are you talking about the internals being balanced or are you referring to the harmonic balancer. I too am confused on this issue..despite all the help everyone has offered.
prozac, is there actually an internal balancer or are you talking about the internals being balanced or are you referring to the harmonic balancer. I too am confused on this issue..despite all the help everyone has offered.
Since the LTX engines are balanced by the flexplate instead of the HB in the front swapping is not going to work unless you balance the new one(or old one in a new engine swap) with the one on the engine.The Corvette HB is unique and cannot be swapped with any other LTx balancer.The balancer is zero balanced.
12-19-2005, 09:04 PM
#5
Melting Slicks
the harmonic balancer is internally balance... i blew my lt4 earlier this year and had to buy a new rotating assembly for it.. that and i built 2 other one piece rear main engines this year and i was interesting finding out what it all was. one peice rear main cranks are described on summit and other places as stock balancing. that will make you scratch your head..
12-19-2005, 09:11 PM
#6
Le Mans Master
Member Since: Dec 2004
Location: Myrtle Beach SC
Posts: 5,789
Likes: 0
Received 7 Likes
on
6 Posts
St. Jude Donor '05-'06
WTF are you talking about?The HB is Zero balanced period.It just spins the belt.The engine is internally balanced per se but the flexplate is weighted to accomplish that.
12-19-2005, 09:41 PM
#7
Safety Car
Originally Posted by Redeasysport
WTF are you talking about?The HB is Zero balanced period.It just spins the belt.The engine is internally balanced per se but the flexplate is weighted to accomplish that.
On some LT1 and LT4 engines the factory used the harmonic damper to fine tune the balance.....
Someone on a post last year actually posted the internal GM memo describing the procedure that was used by the factory....
Harmonic damper should be nuetral balance......but not all are on LTX...real gem when you consider they are not even keyed to the shaft...
Last edited by LT4BUD; 12-19-2005 at 09:45 PM.
12-20-2005, 12:34 AM
#8
Le Mans Master
Member Since: Dec 2004
Location: Myrtle Beach SC
Posts: 5,789
Likes: 0
Received 7 Likes
on
6 Posts
St. Jude Donor '05-'06
Originally Posted by Mr Dave
Is the LT1 and LT4 balanced the same? IE would an LT1 flexplate work with a stock LT4? Same question for balancers.
1.Yes they are balanced the same internally with the flexplate.
2.Probably but why do you want to do it(putting auto tranny on it?)You would have to match balance it to the LT4 one at the least.
3.Balancers are the same and yes there are a few oddball engines out there that do have a balancer that has been tweaked to fine tune the engine.These are rare.Just because the balancer has what appears to be weights and holes drilled in it does not mean it is one of them.OEM balancers were all weighted or drilled to "zero" balance them.
Now onto the non keyed shaft.......
Even though the hub for the balancer is not keyed it IS oriented.With #1 at TDC the arrow on the balancer should be pointed at 12 o'clock.It is easier to make sure you mark it when you pull the hub than doing it though.......
Last edited by Redeasysport; 12-20-2005 at 12:39 AM.
12-20-2005, 07:01 PM
#9
Safety Car
Thread Starter
Originally Posted by Redeasysport
2.Probably but why do you want to do it(putting auto tranny on it?)You would have to match balance it to the LT4 one at the least.
.......
.......
12-20-2005, 08:51 PM
#10
Melting Slicks
Originally Posted by Redeasysport
WTF are you talking about?The HB is Zero balanced period.It just spins the belt.The engine is internally balanced per se but the flexplate is weighted to accomplish that.
12-21-2005, 03:43 AM
#11
Pro
[QUOTE=Redeasysport]Good luck with that.Mabey the Impala and camaro guys can answer your questions then.
all i was trying to say is that the camaro and impala sites have a lot more information on the balancing of the lt1/4. There seem to be a lot more auto-stick conversions and this topic comes up much more there. Also, if you do a search on either site.. You will find tons of information related to balancing. Maybe the cf search engine just isn't very good or maybe it's like i said initially, that there are more gearheads on those sites.
But even on those sites, i can't get a definitive answer. so, i think, I am just going to get my flexplate and flywheel match balanced as someone on this site suggested to me.
all i was trying to say is that the camaro and impala sites have a lot more information on the balancing of the lt1/4. There seem to be a lot more auto-stick conversions and this topic comes up much more there. Also, if you do a search on either site.. You will find tons of information related to balancing. Maybe the cf search engine just isn't very good or maybe it's like i said initially, that there are more gearheads on those sites.
But even on those sites, i can't get a definitive answer. so, i think, I am just going to get my flexplate and flywheel match balanced as someone on this site suggested to me.
12-21-2005, 10:50 AM
#12
The LT1 and LT4 should be very close on factory balance.
OEM flywheels and flexplates are balanced to within a factory tolerance. They are not balanced individually to an engines rotating assembly. With the number of LT1 builts, if they had it would have taken too much time and would make maintenance a nightmare trying to match a flywheel's balance to a specific engine.
As what was said above, the harmonic balancer is also neutrally balanced and also interchangeable.
A board member by the name "No Go" has an LT4 and swapped in a LT1 camaro flywheel without doing any kind of match balancing. He said it ran fine. I swapped in a LT1 camaro flywheel with out match balancing and had great results. You will have no problems with the flexplate on an LT4.
If you go aftermarket though, all bets are off and it would probably be a good idea to look into match balancing.
Below you will find some links with definitive answers.
Info on OEM flywheel/flexplate balancing:
http://web.camaross.com/forums/showt...lance+flywheel
More good info:
http://web.camaross.com/forums/showt...lance+flywheel
OEM flywheels and flexplates are balanced to within a factory tolerance. They are not balanced individually to an engines rotating assembly. With the number of LT1 builts, if they had it would have taken too much time and would make maintenance a nightmare trying to match a flywheel's balance to a specific engine.
As what was said above, the harmonic balancer is also neutrally balanced and also interchangeable.
A board member by the name "No Go" has an LT4 and swapped in a LT1 camaro flywheel without doing any kind of match balancing. He said it ran fine. I swapped in a LT1 camaro flywheel with out match balancing and had great results. You will have no problems with the flexplate on an LT4.
If you go aftermarket though, all bets are off and it would probably be a good idea to look into match balancing.
Below you will find some links with definitive answers.
Info on OEM flywheel/flexplate balancing:
http://web.camaross.com/forums/showt...lance+flywheel
More good info:
http://web.camaross.com/forums/showt...lance+flywheel
12-21-2005, 03:35 PM
#13
Pro
diesel68. thank you for that very specific and the new links. I don't know about mr dave from whom I seem to have hijacked the thread....but it makes me happy
redeasysport...I don't know what your comment to me was all about because sometimes, ones words gets misinterpreted over the internet...and in person but that's another story. but anyway, if you doubt the existence of good quality information on the forums I mentioned, take a close look at the two links above...especially the first one by Rskrouse. I believe he is their "drivetrain moderator". All i have to say, is thank god for forums like the corvetteforum and others, whether specific to the corvette or not. My point earlier was not to promote other sites, only to point to where I have found some good information. My starting point is almost always on the corvetteforum. I know there is much information that has been lost here probably due to our poor search engine...but, that's well known, and the sites I mentioned don't seem to have the same problem. I don't know why that is...the search engines "look" very similar. It's frustrating though!
redeasysport...I don't know what your comment to me was all about because sometimes, ones words gets misinterpreted over the internet...and in person but that's another story. but anyway, if you doubt the existence of good quality information on the forums I mentioned, take a close look at the two links above...especially the first one by Rskrouse. I believe he is their "drivetrain moderator". All i have to say, is thank god for forums like the corvetteforum and others, whether specific to the corvette or not. My point earlier was not to promote other sites, only to point to where I have found some good information. My starting point is almost always on the corvetteforum. I know there is much information that has been lost here probably due to our poor search engine...but, that's well known, and the sites I mentioned don't seem to have the same problem. I don't know why that is...the search engines "look" very similar. It's frustrating though!
Last edited by torchred96; 12-22-2005 at 06:38 AM.
02-27-2006, 09:39 PM
#14
Race Director
Originally Posted by LT4BUD
On some LT1 and LT4 engines the factory used the harmonic damper to fine tune the balance.....
http://forums.corvetteforum.com/show...98&forum_id=48
02-27-2006, 10:58 PM
#15
Safety Car
Originally Posted by Bluewasp
http://forums.corvetteforum.com/show...m_id=48&arch=1
I really don't know......and I don't have the factory damper anymore..
