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Re: Long duration cams and why they work (By panic mechanic)
Posted: Sat Mar 05, 2016 12:58 am
by 1hotTT
Compression comes in to the equation way later than many of us think?
Bleeding compression is direct in relation to:
1) Head design
2) Piston design
3) Valve angle
4) Type of fuel
Most of all would be density of the mixture or coast or at altitude, turbo and or nos, methanol or alcohol...........etc...etc....
Re: Long duration cams and why they work (By panic mechanic)
Posted: Wed Sep 25, 2019 3:54 am
by Ripjaw8520
I hate to ask a unrelated question. But i have a polo1.6 2005/06 BLM motor. Now im chaning the rear main seal. And obviously this specific seal has the pickup. What im asking is. I need the red tag to measure where this pickup and all must be placed to start the car. Or if someone can send me a diagram and measurements. I'd really appreciate it. I bought a brand new seal from goldwagen and it came with sensor. Just need to set this thing so car will start. Please help
Re: Long duration cams and why they work (By panic mechanic)
Posted: Wed Sep 25, 2019 9:13 am
by missioner
Ripjaw8520 wrote:I hate to ask a unrelated question. But i have a polo1.6 2005/06 BLM motor. Now im chaning the rear main seal. And obviously this specific seal has the pickup. What im asking is. I need the red tag to measure where this pickup and all must be placed to start the car. Or if someone can send me a diagram and measurements. I'd really appreciate it. I bought a brand new seal from goldwagen and it came with sensor. Just need to set this thing so car will start. Please help
Use the search function. This has been covered before many times. If the search doesn't help you then Start a new thread and repost your question.
Re: Long duration cams and why they work (By panic mechanic)
Posted: Wed Feb 17, 2021 2:00 pm
by cliffm
As I see it, air has a mass. When you cause air to move, through a tube at a high velocity, then try and stop it or force it backwards, the air at the back of the tube, will still push in the same direction, compressing the air in the middle towards the stoppage, like a spring, until it all comes to a stop. The very reason why the author speaks of "long inlet tubes' so the weight of the remaining air in the long inlet tube continues pushing the "middle" air into the cylinder, even though the piston is trying to push it back out. That is what is meant by "Velocity" on normally aspirated engines. In a turbo setup, this is not an issue, because we are dealing with pressure, not vacuum. So it does not have to rely on the weight of the air to force the remaining air into the cylinder, the turbo does a better job.
I hope that makes it a bit clearer.
Cheers!
Re: Long duration cams and why they work (By panic mechanic)
Posted: Sun Feb 21, 2021 7:21 pm
by gPhilipC
I need some advice. I need to "de tune" my caddy because it changed form being a weekend toy to a daily driver. It has throttles 298 cam and 350cc injectors.
Ican i just install a standard/272 cam.or should i replace the injectors as well. Will the throttles work with smaller injectors?
The internals are stock. It has Spitronics Management. I assume i have to re dyno after words.
Thank you.
Re: Long duration cams and why they work (By panic mechanic)
Posted: Sun Feb 21, 2021 10:30 pm
by missioner
gPhilipC wrote:I need some advice. I need to "de tune" my caddy because it changed form being a weekend toy to a daily driver. It has throttles 298 cam and 350cc injectors.
Ican i just install a standard/272 cam.or should i replace the injectors as well. Will the throttles work with smaller injectors?
The internals are stock. It has Spitronics Management. I assume i have to re dyno after words.
Thank you.
The 272 will help make it more civilized to drive in traffic, the injectors are not a problem as most of them prefer to run at lower duty cycles. Better for longevity of the injector.
Retuning is a must as you would want your tuner to also pay attention to the driveability of the car, which means they need to properly tune the partial throttle positions and adjust the map lower down in the rev range for actual road driving. This is opposed to a track toy that is permanent WOT.
I am not a tuning expert so in this case I suggest doing some homework to find someone who can get the results you are looking for.
I can't personally vouch for these guys but 8V Performance come well recommended by many on the forum, and are known Dictator guys.
Another to consider is Panic's Place. Stefan is an artist with a spanner and is reasonable with his pricing.
Both shops are in the East Rand and easily accessible from the N12. If it's far for you then perhaps ask for a referral to someone in your area.
Re: Long duration cams and why they work (By panic mechanic)
Posted: Mon Feb 22, 2021 11:39 am
by gPhilipC
missioner wrote: ↑Sun Feb 21, 2021 10:30 pm
gPhilipC wrote:I need some advice. I need to "de tune" my caddy because it changed form being a weekend toy to a daily driver. It has throttles 298 cam and 350cc injectors.
Ican i just install a standard/272 cam.or should i replace the injectors as well. Will the throttles work with smaller injectors?
The internals are stock. It has Spitronics Management. I assume i have to re dyno after words.
Thank you.
The 272 will help make it more civilized to drive in traffic, the injectors are not a problem as most of them prefer to run at lower duty cycles. Better for longevity of the injector.
Retuning is a must as you would want your tuner to also pay attention to the driveability of the car, which means they need to properly tune the partial throttle positions and adjust the map lower down in the rev range for actual road driving. This is opposed to a track toy that is permanent WOT.
I am not a tuning expert so in this case I suggest doing some homework to find someone who can get the results you are looking for.
I can't personally vouch for these guys but 8V Performance come well recommended by many on the forum, and are known Dictator guys.
Another to consider is Panic's Place. Stefan is an artist with a spanner and is reasonable with his pricing.
Both shops are in the East Rand and easily accessible from the N12. If it's far for you then perhaps ask for a referral to someone in your area.
Thank you for the advice. I am running Spitronics.
Traffic driving on a Monday morning with a 288cam is not a verry pleasant experience. Once on the free way however...
Re: Long duration cams and why they work (By panic mechanic)
Posted: Sat May 20, 2023 10:04 pm
by Chris276deg
I have a Vw 1.4i 8v
Bought a 276 high lift cam
After installing the cam and tightening the caps, the cam lobe is touching the cylinder head outside of the lifters
Re: Long duration cams and why they work (By panic mechanic)
Posted: Sat May 20, 2023 10:18 pm
by Chris276deg
I have a Vw 1.4i 8v
Bought a 276 high lift cam
After installing the cam and tightening the caps, the cam lobe is touching the cylinder head outside of the lifters
Re: Long duration cams and why they work (By panic mechanic)
Posted: Sun May 21, 2023 4:12 am
by PapaJo
Chris276deg wrote: ↑Sat May 20, 2023 10:18 pm
I have a Vw 1.4i 8v
Bought a 276 high lift cam
After installing the cam and tightening the caps, the cam lobe is touching the cylinder head outside of the lifters
You will need to clearance (remove some material) in the areas where it is touching.