3.8 Engine Damper Alternatives
-
Topic author - Posts: 1296
- Joined: Tue Jun 07, 2016 8:26 pm
- Location: Boston UK
#1 3.8 Engine Damper Alternatives
The 3.8l engine damper is like a dinner plate-almost the diameter of a 45 single.
The 4.2l damper has a much smaller diameter.
Anyone know if a 4.2l crank damper will fit a 3.8 engine? This is so I can attach a normal size trigger wheel.
Or will this mess up the harmonics?
James
The 4.2l damper has a much smaller diameter.
Anyone know if a 4.2l crank damper will fit a 3.8 engine? This is so I can attach a normal size trigger wheel.
Or will this mess up the harmonics?
James
Its true, but Enzo never said it
Too many E types
XK120 SUs
Too many E types
XK120 SUs
Link: | |
BBcode: | |
HTML: | |
Hide post links |
#2 Re: 3.8 Engine Damper Alternatives
I believe a later XJ6 damper will fit. Later design.
Layne
Car #876005, 62 OTS
Car #876005, 62 OTS
Link: | |
BBcode: | |
HTML: | |
Hide post links |
#3 Re: 3.8 Engine Damper Alternatives
It'll fit OK. Can't answer the question about harmonics.
Andrew.
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia
Link: | |
BBcode: | |
HTML: | |
Hide post links |
#4 Re: 3.8 Engine Damper Alternatives
The older it is, the harder and more brittle the rubber will have become, the less effective it will be …
Regards,
ColinL
'72 OTS manual V12
ColinL
'72 OTS manual V12
Link: | |
BBcode: | |
HTML: | |
Hide post links |
-
- Posts: 5698
- Joined: Sun Mar 09, 2008 3:07 pm
- Location: cheshire , england
#5 Re: 3.8 Engine Damper Alternatives
I would be very wary of substituting the later large mass damper for the earlier dinner plate type one. You do not want a fractured crankshaft
Link: | |
BBcode: | |
HTML: | |
Hide post links |
#6 Re: 3.8 Engine Damper Alternatives
I believe it to be a common substitute. Look at all the available High Performance balancers for these engines. None of them have a design like the early ones. Mass seems to be less or same with smaller diameter. Been running one for 25 years on my 3.8 installed by the Jag performance shop that built my engine.
Layne
Car #876005, 62 OTS
Car #876005, 62 OTS
Link: | |
BBcode: | |
HTML: | |
Hide post links |
-
Topic author - Posts: 1296
- Joined: Tue Jun 07, 2016 8:26 pm
- Location: Boston UK
#7 Re: 3.8 Engine Damper Alternatives
Thanks for the input.
I think I will try a 4.2 balancer and see what happens.
The rest of the rotating assembly is off to be balanced next week anyway, so I will add this into the mix.
It is amazing what a difference having it all balanced prior to assembly makes to the smoothness of it all.
I think I will try a 4.2 balancer and see what happens.
The rest of the rotating assembly is off to be balanced next week anyway, so I will add this into the mix.
It is amazing what a difference having it all balanced prior to assembly makes to the smoothness of it all.
Its true, but Enzo never said it
Too many E types
XK120 SUs
Too many E types
XK120 SUs
Link: | |
BBcode: | |
HTML: | |
Hide post links |
#8 Re: 3.8 Engine Damper Alternatives
It’s possible to neatly shrink-fit a much bigger toothed wheel onto the back of the oft-supplied (by UK retailers) ProRace damper, which is actually Australian.
If you search in the Megajolt thread for rfs1957 you should find all the details from when I did it, I would send you the link but am fat-fingers-small-screen in an airport lounge so ………… not tonight.
Much, much neater and more elegant than fitting one on the crank nose.
If you search in the Megajolt thread for rfs1957 you should find all the details from when I did it, I would send you the link but am fat-fingers-small-screen in an airport lounge so ………… not tonight.
Much, much neater and more elegant than fitting one on the crank nose.
Rory
3.8 OTS S1 Opalescent Silver Grey - built May 28th 1962
3.8 OTS S1 Opalescent Silver Grey - built May 28th 1962
Link: | |
BBcode: | |
HTML: | |
Hide post links |
-
Topic author - Posts: 1296
- Joined: Tue Jun 07, 2016 8:26 pm
- Location: Boston UK
#9 Re: 3.8 Engine Damper Alternatives
Thankyou Rory, I will have a look.
Its true, but Enzo never said it
Too many E types
XK120 SUs
Too many E types
XK120 SUs
Link: | |
BBcode: | |
HTML: | |
Hide post links |
#10 Re: 3.8 Engine Damper Alternatives
Details are on Post #425 of the Megajolt thread.
Rory
3.8 OTS S1 Opalescent Silver Grey - built May 28th 1962
3.8 OTS S1 Opalescent Silver Grey - built May 28th 1962
Link: | |
BBcode: | |
HTML: | |
Hide post links |
#11 Re: 3.8 Engine Damper Alternatives
Andrew.
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia
Link: | |
BBcode: | |
HTML: | |
Hide post links |