Alfa Romeo Forums banner

syncro ring issue,,race cars

35K views 82 replies 25 participants last post by  giulia_veloce 
#1 ·
Hi guys

Here in Australia,many Alfa Romeo race car specialists are having gearbox selection issues with the new type syncros sold worldwide,from all the reputable Alfa resellers overseas.
Same problem using genuine Alfa syncros
A major problem is not being able to select 1 or more gears at over 80% race pace..

The issue is premature dog teeth inner circle wear and selector hub wear.
The Syncros are not wearing.

The common gearbox oils have been used including Redline 75-85 NS and Castrol,Valvoline etc.
Gearboxes are 105 + Alfetta transaxles.

I am asking this on behalf of all the serious Alfa race car mechanics in Australia.

Are there problems with race cars overseas ?

We all currently do NOT have problems with ROAD car gearboxes,just race car gearboxes.

Richard Alfa7 has been e-mailed and waiting for a reply.
P Spruell etc will also be asked.

Please,,,,only serious race car guys need reply,whos gearboxes are used and abused for race purposes only.
Hopefully,,we can all learn from this and worldwide specialist replies.

Thanks

Robert
= yes,,im an Alfa Romeo 105 specialist for over 30 years and have built hundreds of gearboxes previously without any problems
 
See less See more
#62 ·
redline gear oil

would you recommend the redline 75w90 NS for street use? I have used MT-90 in all my alfas for years. this is a GL-4 oil that specifically says is safe for brass components. I am now getting some gear noise in 2nd and 4th gears ( no synchro problem). I am thinking of changing to the 75w90 NS before tearing the gearbox down.

Any insight?

Thanks
 
#63 ·
Other than cost, there is no reason not to give it a try. I use it on one of my two GTA CR transmissions on the street with no issues. This is, however, just my experience.
 
#66 ·
From my experience with brass bushings in Ferrari transaxles, even the 90 EP that would turn the brass black, ONLY did that when it oxidized over time. If we changed the lube either annually, or if it was cooked as in racing, nothing turned black. If we let it cook, cool, and cook again, brass got black. If it sat unused, for years, brass turned black. Flush the brakes, and clutch, change the transaxle lube at each oil change or annually, and there were no issues.
 
#69 ·
#75 ·
Syncros

Once you pruchase and install aftermarket syncros and they prove to be less than great you are out all the effort and $$ you have spent.

I strongly suggest you avoid any aftermarket pieces and call Larry at APE, He will sell you as new syncro parts very reasonably. I`ve never gotten a syncro from him that I was not happy with. I will only use OEM parts until someone proves the alternatives hold up in race application.
Too much "great new product" Chinese junk out there.
 
#77 ·
I even used genuine Alfa Romeo syncros ( $265 each) with a Yellow dot on them and had the same failures.
Im waiting to see how the new ones work= someone else tries them.
Amazing how a certain specialist had never had any problems,,and now has a solution.
Why would you have a solution if you stated you never had a problem to start with.

Richard,,are you using the syncros in race cars with high performance engines ?
Sounds like a good solution = larry at APE

Robert
 
#79 ·
Well Richard

You do have a great reputation and always tell it how it is,,which is great.
Your advice is to purchase the genuine syncro rings from Larry at APE
As I said before,,I used genuine syncros rings and had problems
The genuine syncro rings had a yellow dot on them.
Do the genuine syncros you use from APE have a yellow dot on them ?
I will still do more research,but will proably purchase the syncros directly from you.
Anyone used the supposedly new generation syncros from a very reputable Alfa Parts Supplier in race applications yet ?

Robert
 
#80 ·
Syncronisers

If you go back to the beginning of this thread, I suggested using the same parts.
And pointed out that perhaps the level of preparation and assembly might, as well, be part of the failures.

However 95% of issues are probably attributable to one problem.
DRIVERS! These transmissions / transaxles cannot be speed shifted.
If the dog teeth are smashed with barbs at the top that`s driver not parts.
 
#81 ·
my experience confirms that.i've had perhaps twenty alfas but never bought one new.some have come with hard shifting and some have not.the ones that had decent shifting never got worse.and i've done a few hundred thousand miles.i had one that stoped going into gear.i'm going to remove that one soon and i suspect the selector fork.obviously the part of the fork which engages the slider is defective.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top