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R-fastmotorsport
Re: A series engine weaknesses
#25
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Hang on a minute .......
all these traitors slinging off at the mighty datto Any and ALL items of mechanical nature will fail with age, fatigue, misuse, or stretched to their design limit I agree that the PCD of the flywheel bolts is too small and the lack of positive location can cause heartache with a missed shift But really, for the HP we squeeze out of them, their age, simplistic design and compact nature, they are a really awesome little engine!! Despite the swap to L-series, I still love the hard revving little A
Cheers

Posted on: 2006/8/5 10:30
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Dodgeman
Re: A series engine weaknesses
#24
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Quote:

A14force wrote:
aside from big ends bols breaking, I've never heard of the rods failing.

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This is an abberation, not a weakness, but even A15's can have a problem sometimes.
This one had a camshaft problem. [The rod took a lobe clean out of the middle of it]







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Posted on: 2006/8/5 9:58
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blofly
Re: A series engine weaknesses
#23
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Quote:
If ever an A series flywheel breaks up during a missed shift, the fender will be the least of your worries as that flywheel is prety much in line with your foot.


YIKES makes me happy to have an auto! but I have fitted some cool datsun floor mats just in case!

Posted on: 2006/8/5 9:50
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A14force
Re: A series engine weaknesses
#22
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My first a12 was held at 6000rpms for the best part of a day. It had no T/stat, and was stone cold.

IMO the less than perfect aspect of the A series would be,
The rod bolts as discussed
The stock cast pistons have the limitations that go with casties
The springs on the rockershaft need to be replaced with bushes. This imptoves lubrication, and prevents the rockers migrating resulting in bent push rods.
The PCD of the flywheel is too small.

aside from big ends bols breaking, I've never heard of the rods failing.

Posted on: 2006/8/5 9:09
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killer1200
Re: A series engine weaknesses
#21
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Quote:

Dodgeman wrote:
Quote:

blofly wrote:
Craig advised me to use loctite on the threads and the bolt face to insure against a big metal frisbee exiting out the fender during a missed gear change.
If ever an A series flywheel breaks up during a missed shift, the fender will be the least of your worries as that flywheel is prety much in line with your foot.


Thats true.

I couldnt find the photo of the clutch that went bang I'm just thankful I wasnt driving.

Someone else might have more luck.

Posted on: 2006/8/5 9:03
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Put stupid oversized photo here>>
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Dodgeman
Re: A series engine weaknesses
#20
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Quote:

blofly wrote:
Craig advised me to use loctite on the threads and the bolt face to insure against a big metal frisbee exiting out the fender during a missed gear change.
If ever an A series flywheel breaks up during a missed shift, the fender will be the least of your worries as that flywheel is prety much in line with your foot.

Posted on: 2006/8/5 8:53
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blofly
Re: A series engine weaknesses
#19
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I almost fell over when I heard they ran steel rods and a steel crank. I couldn't believe it when I seen the stock double row tming chain and I couldn't believe that those weak APPEARING rockers can handle huge rpm with only wear issues not breakage issues!
One tip I received was to use 302 winsor conrod bolts if you want to achieve reliable big RPM, also with the flywheel bolts Craig advised me to use loctite on the threads and the bolt face to insure against a big metal frisbee exiting out the fender during a missed gear change.

Posted on: 2006/8/5 8:20
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pager
Re: A series engine weaknesses
#18
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Classic stories about a12!! love em

Posted on: 2006/8/5 7:21
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datsun_guy
Re: A series engine weaknesses
#17
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the terminator of the motor world considering that some are coming up to 30 year old and are now being turbo charged and run reliably i think is amazing

Posted on: 2006/8/5 6:21
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Re: A series engine weaknesses
#16
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a series is storng, no dounbt about it, but i wouldnt say they are not with out their "niggles".

I know of an old lady that ran it for 1 year with oil below the E mark..... just ran hot (she went to my mechanic for a service one day, first in 5 years)
they take abuse thats for sure... and my favorite... they have timing chains... i love engines with timing chains

Posted on: 2006/8/5 5:55
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