How much boost can you run on a stock engine?
09-27-2004, 10:27 PM
#11
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Originally Posted by AusS2000,Sep 27 2004, 08:14 PM
The topic is correct. The word 'stock' is used as opposed to 'built'. The engine stock is designed for high compression NA and is not suitable for a lot of boost.
09-27-2004, 10:44 PM
#12
Originally Posted by itryan,Sep 28 2004, 04:27 PM
Isnt the F20C prized for having alot of displacement for 2.0L engine? This has something to do with the high compression right?
LOL, no , 2L IS the displacement (ok, so it's actually 1997).Displacement is the volume of the cylinder when the piston is at the lowest point minus the volume when it is at the highest point times the number of cylinders. Hence the swept volume.
Compression ratio is the ratio of the volume of the cylinder when the piston is at the lowest point to the volume when it is at the highest point.
By rough calculation if the F20C displaces 2L and is has four cylinders that's 500cc each. If the compression ratio is 11:1 that means the volume above the piston at top dead center is 1/11th of the area above the piston at bottom dead center. So the (Swept + Unswept) = 11 x Unswept. Or Unswept = Swept/10. As the swept volume of each cylinder is 500cc the unswept volume is 50cc.
That was fun and all but doesn't address the issue. The F20C has a high horsepower for the displacement. It does this by having a high compression ratio and good breathing and components to allow high revs.
09-28-2004, 06:14 AM
#13
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Originally Posted by xviper,Sep 27 2004, 06:08 PM
I'm betting that you have your belt tightened way too tight in the belief that really tight will ensure max boost. Do you check the belt in the manner as prescribed in the kit installation manual? I've had my belt tightened once since it's install. This was the first tightening as dictated by the Vortech manual. It has been over a year and a half since and the belt is still at the right tightness (confirmed by the boost gauge) and it is still is good condition. Another possibility is that one of your pulleys is not running straight and true.
There have been indications of 11 psi putting out around 350 WHP. Boost in only part of the equation. It is the state of tune. You can have less boost but a higher state of tune to get more HP. This may not necessarily be better or safer than higher boost in a lesser state of tune to get about the same HP. You need to look at the whole equation and not just one variable.
There have been indications of 11 psi putting out around 350 WHP. Boost in only part of the equation. It is the state of tune. You can have less boost but a higher state of tune to get more HP. This may not necessarily be better or safer than higher boost in a lesser state of tune to get about the same HP. You need to look at the whole equation and not just one variable.
On another note I added a NX 50 shot, wet. I know, I know, be safe. I got a really good buy on it and said what the hell. I have heard that you should go 2 steps colder on the plugs. How does that effect the AEM EMS? If any?
XViper, I am learning a lot from ya, any help I really appreciate! Thanks again.
09-28-2004, 09:26 AM
#14
Go 2 steps colder on the plugs but ONLY if you can get away with it (fouling). Generally, guys go 1 step colder for daily use and many just stick with the stock heat range. I used the OEM plugs (regapped of course) for about a year with no issues, but then, I live in a cold climate 1/2 the year.
09-28-2004, 09:43 AM
#15
I believe a member on here named Jason was running 11 psi on his stock engine for a while. IIRC he just recently had a problem with one of his retainers or valves though.
I def wouldn't go any higher than that on stock internals. Just my $.02.
I def wouldn't go any higher than that on stock internals. Just my $.02.
09-28-2004, 10:38 AM
#16
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Originally Posted by AusS2000,Sep 27 2004, 10:44 PM
LOL, no , 2L IS the displacement (ok, so it's actually 1997).Displacement is the volume of the cylinder when the piston is at the lowest point minus the volume when it is at the highest point times the number of cylinders. Hence the swept volume.
Compression ratio is the ratio of the volume of the cylinder when the piston is at the lowest point to the volume when it is at the highest point.
By rough calculation if the F20C displaces 2L and is has four cylinders that's 500cc each. If the compression ratio is 11:1 that means the volume above the piston at top dead center is 1/11th of the area above the piston at bottom dead center. So the (Swept + Unswept) = 11 x Unswept. Or Unswept = Swept/10. As the swept volume of each cylinder is 500cc the unswept volume is 50cc.
That was fun and all but doesn't address the issue. The F20C has a high horsepower for the displacement. It does this by having a high compression ratio and good breathing and components to allow high revs.
09-28-2004, 11:47 AM
#17
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Originally Posted by bigpurp,Sep 28 2004, 11:43 AM
I believe a member on here named Jason was running 11 psi on his stock engine for a while. IIRC he just recently had a problem with one of his retainers or valves though.
I def wouldn't go any higher than that on stock internals. Just my $.02.
I def wouldn't go any higher than that on stock internals. Just my $.02.
Maybe with a 50 shot it will keep me chill for a while.
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