Hey people,as the title asks, i have a 1.3 sierra and it detonates under load, just want to know if this is standard or can it be fixed?
thanx, dale...
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How do you stop detination in a 1.3lt zook motor?
How do you stop detination in a 1.3lt zook motor?
Rides:
- 93, Toyota Landcruiser Turbo Diesel
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- 93, Toyota Landcruiser Turbo Diesel
- 93, Suzuki Vitara Estate
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Assuming your donk is in good condition and all things like valve clearance, compression, healthy spark and correct mixture, I agree with Pat. I've cranked my 1.3 sierra up to 9.5 deg btdc and run Optimax and compared to the way it use to ping nearly all the time on the stock setting of 7 deg btdc on standard unleaded, it now ppulls like a 14 year old with no pinging what so ever. Give it a try, you might be surprised. Oh btw, now more rotten egg emissions when running on the high octane stuff either. It use to smell like a sewerage works was following me around on the standard fuel.
run some combustion chambe cleaner thru it to de-coke it. carbon sticks to and builds up in the chambers and to the top of the pistons. it gets very hot and creates hotspots, and ignites the fuel before the spark plug. also will help with power, as you will be able to fit more air/fuel in. and the flow will be unobstructed.
carby
try rebuilding your carby aswell. I am running a rebuilt carby on a 170,000 motor and guy guy who i bought the motor off said that it sometimes knocked on crappy fuel. I dont have that problem so thats solid proof. Lately i have started putting in good fuel as well, just as insurance. Btw optimax is 95% bp ultimate is 98% that 3% can sometimes make the difference.
Re: carby
95% and 98% what?jcianci wrote: Btw optimax is 95% bp ultimate is 98% that 3% can sometimes make the difference.
It's funny you say that, Optimax seems to have a 7 week shelf life, then turns to sh1t. Does BP do the same?diffbreaker wrote:BP Ultimate is Optimax
Both are 98 RON
Why do I know?
I work at the oil refinery that loads the BP road tankers.
Yep, the only difference between Ulimate & Optimax is the bowser they go into.
Tune the motor well, use the factory timing marks purely as a reference to get the thing running.
I have found that the best timing is found more by trial and error than with a timing light.
Every 1.3 I have seen tuned by someone that does not know that particular make of motor is a gutless slug that is quite heavy in fuel for its size. It will also ping like a mofo given that they run realitively low compression ratio of 8.9 to 9.1
Of the motors that I have pulled down or seen pulled down not a single one had anything in the way of coke build up in it..
Here is what I have done in the past to time these lilttle donks.
Mark the distributer housing to the dizzy locking bolt with a pencil.
Use timing light to get an idea of where the timing is at to begin with
set it at about 10degree's btdc.. take it for a quick thrash .. see how it runs.
if it begins to ping back it off a lil bit (and I mean a TINY bit) repeat quick thrash up a small hill, does it ping. lock distributer bolt and use a scribe to mark it, so if it moves you can line the marks back up to get a better idea of where to start again.
I have found that the best timing is found more by trial and error than with a timing light.
Every 1.3 I have seen tuned by someone that does not know that particular make of motor is a gutless slug that is quite heavy in fuel for its size. It will also ping like a mofo given that they run realitively low compression ratio of 8.9 to 9.1
Of the motors that I have pulled down or seen pulled down not a single one had anything in the way of coke build up in it..
Here is what I have done in the past to time these lilttle donks.
Mark the distributer housing to the dizzy locking bolt with a pencil.
Use timing light to get an idea of where the timing is at to begin with
set it at about 10degree's btdc.. take it for a quick thrash .. see how it runs.
if it begins to ping back it off a lil bit (and I mean a TINY bit) repeat quick thrash up a small hill, does it ping. lock distributer bolt and use a scribe to mark it, so if it moves you can line the marks back up to get a better idea of where to start again.
" If governments are involved in the covering up the knowledge of aliens, Then they are doing a much better job of it than they do of everything else "
"optimax is crap, I wouldn't run it by choice."
Nothing like a happy customer. If you prefer Ultima over Optimax then that's all that matters.
As long as Sydney based customers are aware that the Ultima they are happily filling their tanks with comes from the Optimax loading gantry at the Shell Clyde Refinery at Rosehill. Shelf life should not be any different from either of the two fuels seeing they are the identical product. I've heard industry gossip about high performance vehicles beeing effected by shelf life but Octane rating just doesn't drop away in a sealed vessel like a fuel tank so I don't know what the rev heads base that claim on. I wouldn't rate a Sierra in that HP catagory anyway? Not with a massive 34.5kw at the back wheels 
On the original pinging post, another thing you could try is "power timing".
That is setting your ignition timing at idle with a vacuum guage.
Max vacuum should be the ideal timing.
Give it a try?
Nothing like a happy customer. If you prefer Ultima over Optimax then that's all that matters.
As long as Sydney based customers are aware that the Ultima they are happily filling their tanks with comes from the Optimax loading gantry at the Shell Clyde Refinery at Rosehill. Shelf life should not be any different from either of the two fuels seeing they are the identical product. I've heard industry gossip about high performance vehicles beeing effected by shelf life but Octane rating just doesn't drop away in a sealed vessel like a fuel tank so I don't know what the rev heads base that claim on. I wouldn't rate a Sierra in that HP catagory anyway? Not with a massive 34.5kw at the back wheels On the original pinging post, another thing you could try is "power timing".
That is setting your ignition timing at idle with a vacuum guage.
Max vacuum should be the ideal timing.
Give it a try?
Mobil Synergy is my fuel of choice, it has made more power on the dyno than fresh Optimax, in a supercharged Commodore. I think BP is fairly new here in VIC, so it is good to know it's origins.diffbreaker wrote:"optimax is crap, I wouldn't run it by choice."
Nothing like a happy customer. If you prefer Ultima over Optimax then that's all that matters.
On the original pinging post, another thing you could try is "power timing".
That is setting your ignition timing at idle with a vacuum guage.
Max vacuum should be the ideal timing.
Give it a try?
As you are in the know, could the shelf life "thing" be similar to keeping drums of fuel off concrete floors? As storing them on concrete sends them "off" quickly too.
Posts: 912
Joined: Tue Nov 09, 2004 6:29 pm
Joined: Tue Nov 09, 2004 6:29 pm
Location: {Sydney, Australia or Rio, Brazil Ride: Sierra JXi}
i use Vortex 95 in my mazda funtop simply because it's close to home and i get woolworths staff discount (auto 4c a litre) In fact i delibrately fill it to 10.40 cause i get the 40cents back. It doesn't ping and that's why i stopped paying the extra cents for Vortex 98. 
Now my suzuki is a different matter, i've tried vortex 98 and optimax 98 (local shell distigushes the difference between two optimaxes) and i have to say all though they it's better than running regular (ony slight, the car had excelent service history and carb was rebuilt prior to purchase
)
i actually now prefer to fill up at Forestville Ethanol.
( 98RON with up to 10% acohol) It feels slightly smoother and i know what's in it (rather than wondering what cancer causing trash is in the others)
I'm happy that it's cleaning out the gunk (and the seals slightly but that takes months/years) which is why i use it. As for the seals i'm not to worried as although the engine is sound and 100% i'm pulling the baby apart at the end of the year for a cultus upgrade
Now my suzuki is a different matter, i've tried vortex 98 and optimax 98 (local shell distigushes the difference between two optimaxes) and i have to say all though they it's better than running regular (ony slight, the car had excelent service history and carb was rebuilt prior to purchase
)i actually now prefer to fill up at Forestville Ethanol.
( 98RON with up to 10% acohol) It feels slightly smoother and i know what's in it (rather than wondering what cancer causing trash is in the others)I'm happy that it's cleaning out the gunk (and the seals slightly but that takes months/years) which is why i use it. As for the seals i'm not to worried as although the engine is sound and 100% i'm pulling the baby apart at the end of the year for a cultus upgrade
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Suzuki, Jeep & Toyota Soft tops with welded seams for SALE (PM me)
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