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Gonflez votre moteur moteur F8B

 
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legend


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MessagePosté le: Lun 7 Sep - 09:56 (2009)    Sujet du message: Gonflez votre moteur moteur F8B Répondre en citant

  
Vous voulez voir ça sur votre compteur apres avoir gonfler votre suzuki M.800 ?  
All the Suzuki have the same engine/platform. So it is very cheap to maintain, because second hand parts can be found at almost any junkyard and are cheap! The same car and engine are also sold as the Daewoo Tico and in India as the Maruti 800. The F8B moteur is also mounted in the Suzuki Mightyboy and Suzuki Hatch.
 
 
 
General specification:
Engine code: F8B
Capacity: 796cc
Nominal bore: 68.5mm
Stroke: 72.0mm
Compression ratio: 8.7:1
Max power output: >29.5kW/39.5bhp @ 5500rpm
Power output per litre: >37kW/49,7bhp
Power to weight ratio: 64,1bhp/ton (616Kg)
Max torque: 59 Nm @ 3000rpm
Torque per litre: 74,1Nm
Torque to weight ratio: 95,8Nm/ton
Intake 31.6mm Exhaust 27.6 (valve head diameter)
Rocker ratio: about 1.48

Rapport de boite:
4 speed F8B gearbox gear ratio's:
Gear  
Gear Ratio   
Speed Ratio   
1  
43/12  
3,583  
2  
39/18  
2,166  
3  
32/24  
1,333  
4  
27/30  
0,900  
Reverse  
37/22x22/11  
3,363  
Final  
87/20  
4,350  

4 speed F5A gearbox gear ratio's:
Gear  
Gear Ratio   
Speed Ratio   
1  
43/12  
3,583  
2  
39/18  
2,166  
3  
33/24  
1,375  
4  
28/30  
0,933  
Reverse  
37/22x22/11  
3,363  
Final  
90/17  
5,294  

 
So you don't need a lot of extra horsepower, or a lot less weight, to make driving your Suzuki  much more fun!
Tuning your Suzuki  consists of increasing the compression ratio, enlarging the intake ports and larger in- and exhaust valves. You can also remove some of the camshaft spline on one end, so you can alter the camshaft timing a few degrees!
By increasing the compression ratio to about 9.5 you will get much(!) better throttle responce, more power and more torque. The downside is that the engine will vibrate slightly more when idling. Even with a compression ratio of 9.5:1 it was impossible to get the engine to "pink" or get it to the point where detonation or pre-ignition occurs. No matter where you put the ignition timing. (Tested on unleaded 95 and BPR6ES spark plugs). Because the head sits lower on the blok, you get different, read retarded, valve timing! Tuning the valvetiming is pretty difficult, I filed one side of the camshaft spline, so you can alter the camshaft timing a few degrees!
General guideline to engine tuning: "The 80% Rule". Which means that the intake port area should be max. 80% of the intake valve area, the exhaust valve area should be about 80% of the intake valve area and the exhaust port area should be 80% of exhaust valve area!
In a lot of engines the 80% is already applied. so you can just use the exhaust valve to check the intake port area. It should be a tight fit. In case of the F8B engine is the exhaust valve area is 76,3% of the intake valve area.
 
The cylinderhead still mounted on my 1985 Suzuki  F8B engine, just removed the valve cover.
This is how the head looked like, when I took it off. I have had the head skimmed by 0.85mm to increase the compression ratio to about 9.5 instead of 8.7 to 1. Skimming the head by 0.85mm will just skim the squich area (the bump on the bottom left of the combustion chamber). Do not forget install the BPR6ES sparkplugs instead of the BPR5ES! Otherwise your engine starts pinging at around 105kmh. (Glow ignition!)
You can clearly see the obstruction in the inlet port. So you know what to do... Bore the intake port to a nice round 28mm in diameter. Tip: You can use the exhaust valve to measure the diameter, and at the same time to see if the port is nicely round! You can also use 3 28mm wood drills to get the size right.
Note: No carbon deposits on valve or intake port. So in original configuration there are extremly high gas speeds!
Smooth the edges in the combustion chamber next to the intake and exhaust valve seat. This will increase torque significantly. Polishing the combustion chamber prevents carbon buildup.
A closeup in the inlet manifold: you can see the rough finish near the valve seat. Remove all the roughness and the
A close inspection of the rockers revealed that one of them (exhaust side) was totally worn.
The same wear pattern shows up at the camshaft. Replacing both camshaft and rockers is the only solution to this.
 Although I do not have a picture of the intake manifold, you will have to make sure the diameter is enlarged to about 27mm. An easy way of doing this is buying a few 28mm stealbrushes that fit in a drill. For the curved channels you have to use an extension (5mm tap end) that fits through the vacuum hole on the left. Tip: You can use the exhaust valve to see if the diameter is OK.
Make sure you have the same amount of aluminium alloy dust laying on your bench after you fininshed working on one port of your head.
No comment
The result after tuning... Nice and off the scale! Almost 160! Not bad for a tuned 796cc engine! Expect acceleration times from 0-100kmh (60mph) in about 13 seconds. My personal record is 165, this was with 145/80/12 tires, which are 10.6% larger in diameter, and "spot on" 150 on speedo.
Also remember: after tuning the F8B you should not drive it that hard without proper cooling; After 10 minutes of driving to the max you will get oil temperatures of up to 160 degrees C! I did not do anything about it, only regular oil changes and semi-synthetic 10w40 oil. Perhaps you can install an oil cooler, or build a water to oil cooler yourself.
 


Dernière édition par legend le Lun 7 Sep - 10:06 (2009); édité 1 fois
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MessagePosté le: Lun 7 Sep - 09:56 (2009)    Sujet du message: Publicité

PublicitéSupprimer les publicités ?
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bbstba
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MessagePosté le: Mer 9 Sep - 09:49 (2009)    Sujet du message: Gonflez votre moteur moteur F8B Répondre en citant

ca me tente, mais y a t il un risque  sahbi ??
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bbstba
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MessagePosté le: Mer 9 Sep - 09:50 (2009)    Sujet du message: Gonflez votre moteur moteur F8B Répondre en citant

y a pas une version en francais ou arabe ??, ca m'aiderai
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legend


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MessagePosté le: Mar 15 Sep - 10:16 (2009)    Sujet du message: Gonflez votre moteur moteur F8B Répondre en citant

tres tentant cette modification, mais quelques aprehensions quand meme
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MessagePosté le: Aujourd’hui à 06:45 (2016)    Sujet du message: Gonflez votre moteur moteur F8B

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