My New Spec...
09-04-2008, 07:54 PM
#121
I thought we were going solid lifters on your engine??
Regarding the hydraulic v solid lifter thing...
I have been running solid lifters on most of my 500 + Hp engines for years (and have be ridiculed for doing so) but until you have tried it please don't knock it, it IS the way to go!!
Karl, you give too much away
Martin.
09-04-2008, 08:06 PM
#124
10K+ Poster!!
Jason,
I thought we were going solid lifters on your engine??
Regarding the hydraulic v solid lifter thing...
I have been running solid lifters on most of my 500 + Hp engines for years (and have be ridiculed for doing so) but until you have tried it please don't knock it, it IS the way to go!!
Karl, you give too much away
Martin.
I thought we were going solid lifters on your engine??
Regarding the hydraulic v solid lifter thing...
I have been running solid lifters on most of my 500 + Hp engines for years (and have be ridiculed for doing so) but until you have tried it please don't knock it, it IS the way to go!!
Karl, you give too much away
Martin.
do the solids need constant adjusting Martin?
10-04-2008, 08:49 AM
#128
I agree that any engine that is going to revved consistantly beyond 7500rpm SHOULD have solid lifters for the reasons stated. However, if an engine is going to be rev limited to 7250, then I see no reason to have them. However, I would listen to what my engine builder wanted in the engine after I explained how the car would be used. My 180mph 500bhp engine and Paul's engine are on hydraulics. However, for top speed runs, I personally would consider solid lifters essential.
Euan,
Just read Chip's comments regarding YUMs top speed run on that thread. When you hold the engine at high rpm for a long distance, the lifters get hammered that much, that they pump all the oil out of them
. You can tell when this happens, as the valve gear suddenly goes all rattley at the end of the run. What effect this has on the engine is that the valve opening / closing duration goes to rat-shit, leading to a loss of power until the lifters pump back up again. It doesn't cause any detrimental damage (although the VE goes haywire to what it was mapped to, so the car can run very rich), but does increase the wear and tear on the valve train.
Running solid lifters negates this, but they become a servicable item and should be shimmed every 6-10,000 miles (or when the top end noise dictates it is time to do so).
Euan,
Just read Chip's comments regarding YUMs top speed run on that thread. When you hold the engine at high rpm for a long distance, the lifters get hammered that much, that they pump all the oil out of them
. You can tell when this happens, as the valve gear suddenly goes all rattley at the end of the run. What effect this has on the engine is that the valve opening / closing duration goes to rat-shit, leading to a loss of power until the lifters pump back up again. It doesn't cause any detrimental damage (although the VE goes haywire to what it was mapped to, so the car can run very rich), but does increase the wear and tear on the valve train.Running solid lifters negates this, but they become a servicable item and should be shimmed every 6-10,000 miles (or when the top end noise dictates it is time to do so).
10-04-2008, 05:02 PM
#131
10K+ Poster!!
iTrader: (9)
Join Date: May 2004
Location: birmingham west mids
Posts: 11,919
Likes: 0
Received 11 Likes
on
9 Posts
(in very basic terms, and In my interpretation of things 
) Don't forget this is a dynamic pressure as well, so even if the engine is doing 7500RPM and the turbo is spinning at 100,000 rpm, the turbine wheel and wastegate can only flow so much gas before reaching choke point, where it cannot physically 'fit' or flow any more gas through the avaliable holes 
10-04-2008, 05:44 PM
#132
Almost there!
iTrader: (4)
Join Date: Jun 2003
Location: Gatwick (ish)
Posts: 7,434
Likes: 0
Received 0 Likes
on
0 Posts
all this input, i can gladly say im more than happy with what Karl and Martin have put across.
i drove Andys car last night, clocked up a few miles on part throttle and generally got a feeling how the package worked for those mild driving moments and its ability to plod along gracefully and i was very impressed, then gave it a few miles of full throttle, car was perfect - the smooth way it picked up and the way it seemed to grow stronger and stronger as the revs increased - a very well put together engine and a perfect partnership between Martoon and Karl.
im hoping mines going to be a stormer
i drove Andys car last night, clocked up a few miles on part throttle and generally got a feeling how the package worked for those mild driving moments and its ability to plod along gracefully and i was very impressed, then gave it a few miles of full throttle, car was perfect - the smooth way it picked up and the way it seemed to grow stronger and stronger as the revs increased - a very well put together engine and a perfect partnership between Martoon and Karl.
im hoping mines going to be a stormer
Last edited by Kelv; 10-04-2008 at 05:45 PM.
10-04-2008, 09:43 PM
#135
No, because there is no restriction bar the exhaust from there, you are interested in the pressure between the exhaust ports in the head and the entry to the turbine wheel, as if there is more pressure there than boost pressure, how can the engine get rid of the waste gasses from the cylinders? (in very basic terms, and In my interpretation of things ) Don't forget this is a dynamic pressure as well, so even if the engine is doing 7500RPM and the turbo is spinning at 100,000 rpm, the turbine wheel and wastegate can only flow so much gas before reaching choke point, where it cannot physically 'fit' or flow any more gas through the avaliable holes
(in very basic terms, and In my interpretation of things ) Don't forget this is a dynamic pressure as well, so even if the engine is doing 7500RPM and the turbo is spinning at 100,000 rpm, the turbine wheel and wastegate can only flow so much gas before reaching choke point, where it cannot physically 'fit' or flow any more gas through the avaliable holes
11-04-2008, 06:23 AM
#137
PassionFord Post Whore!!
11-04-2008, 06:29 AM
#138
10K+ Poster!!
iTrader: (2)
Join Date: May 2004
Location: UK
Posts: 11,383
Likes: 0
Received 0 Likes
on
0 Posts
all this input, i can gladly say im more than happy with what Karl and Martin have put across.
i drove Andys car last night, clocked up a few miles on part throttle and generally got a feeling how the package worked for those mild driving moments and its ability to plod along gracefully and i was very impressed, then gave it a few miles of full throttle, car was perfect - the smooth way it picked up and the way it seemed to grow stronger and stronger as the revs increased - a very well put together engine and a perfect partnership between Martoon and Karl.
im hoping mines going to be a stormer
i drove Andys car last night, clocked up a few miles on part throttle and generally got a feeling how the package worked for those mild driving moments and its ability to plod along gracefully and i was very impressed, then gave it a few miles of full throttle, car was perfect - the smooth way it picked up and the way it seemed to grow stronger and stronger as the revs increased - a very well put together engine and a perfect partnership between Martoon and Karl.
im hoping mines going to be a stormer
11-04-2008, 04:52 PM
#142
10K+ Poster!!
13-04-2008, 07:33 PM
#145
Testing the future
great thread
regarding back pressure - depending on the size of the exhaust system (and number of boxes, bends, length etc), then having the outlet of the external wastegaste returning to the exhaust system will in all likelihood have an increased back pressure over one that vents separately. it is simple physics as more mass flow will be going through the main exhaust system (although there are many factors involved and you would need back to back testing on different 'screamer pipes' to prove it)
regarding back pressure - depending on the size of the exhaust system (and number of boxes, bends, length etc), then having the outlet of the external wastegaste returning to the exhaust system will in all likelihood have an increased back pressure over one that vents separately. it is simple physics as more mass flow will be going through the main exhaust system (although there are many factors involved and you would need back to back testing on different 'screamer pipes' to prove it)
Thread
Thread Starter
Forum
Replies
Last Post
mk6turbo
Cars for Sale
9
07-02-2014 07:48 PM
