.48/55 vs .48/60 T3 on a RST..
26-06-2011, 09:42 AM
#41
Good to hear that you are putting on a little larger turbo.
I will be most interested to hear how the .48 exh, 60 trim compressor T3 works out on your 1.6.
I can't remember what valvesprings you were using?
Standard Ford singles are good, but nowhere near enough pressure to allow 7800 rpm.
Anyone who has a 7000+ rpm standard Ford single spring 1.6, has a faulty rev counter
Cheers
I will be most interested to hear how the .48 exh, 60 trim compressor T3 works out on your 1.6.
I can't remember what valvesprings you were using?
Standard Ford singles are good, but nowhere near enough pressure to allow 7800 rpm.
Anyone who has a 7000+ rpm standard Ford single spring 1.6, has a faulty rev counter
Cheers
Stock Ford springs mate yes.
What springs do you run now then Jimbo, what would you recommend?
26-06-2011, 03:50 PM
#45
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I thought Ford springs were around 160lb and Newman around 210lb but I cant remember exactly. I might be wrong though.
I actually meant Kent springs and not Newman though too!! I tested inlet pressures up to 70psi without valve float on the Kent springs with all valves closed with the head on the bench.
I've tested an unknown set of doubles at 40 psi at up to 6000rpm without valve float on a running engine on a T34. They were a set supplied on an NMS head though.
I actually meant Kent springs and not Newman though too!! I tested inlet pressures up to 70psi without valve float on the Kent springs with all valves closed with the head on the bench.
I've tested an unknown set of doubles at 40 psi at up to 6000rpm without valve float on a running engine on a T34. They were a set supplied on an NMS head though.
26-06-2011, 09:10 PM
#48
Too many posts.. I need a life!!
There is much more to a valve spring than its "rated" pressures.
How many engine builders measure the installed spring height, and then
measure the actual spring pressure at that installed height?
I bet not many!
Checking springs with compressed air is not really a valid test - all it does is check for a bad valve grind job.
That is why some engines rev much more than other engines with the same springs.
Different installed heights.
Just my opinions
How many engine builders measure the installed spring height, and then
measure the actual spring pressure at that installed height?
I bet not many!
Checking springs with compressed air is not really a valid test - all it does is check for a bad valve grind job.
That is why some engines rev much more than other engines with the same springs.
Different installed heights.
Just my opinions
26-06-2011, 10:49 PM
#49
Will be interesting to see what it's like with the new one at the same limit.
27-06-2011, 01:22 AM
#50
Too many posts.. I need a life!!
When your turbo stops flowing the boost pressure it can supply to the engine drops dramatically.
Boost has a large impact on the onset of valve bounce.
With 19 psi boost at 6500 rpm you may experience the same fate as Jimbo.
You will find out soon
Cheers
Last edited by Canada1; 27-06-2011 at 01:24 AM.
27-06-2011, 07:24 AM
#51
same here, when i was only running 240-250 i could walk it up to the rev limit of 6500 without any problem
we was looking at 280bhp at 6500 and it would not have it
soon as the new springs went in it was fine, was going to have a look at 7k but it was just falling off torque wise at 6500 so thought theres no point
you may run into the same but its a easy job to do
27-06-2011, 08:59 AM
#52
You are exactly right Karlos,
When your turbo stops flowing the boost pressure it can supply to the engine drops dramatically.
Boost has a large impact on the onset of valve bounce.
With 19 psi boost at 6500 rpm you may experience the same fate as Jimbo.
You will find out soon
Cheers
When your turbo stops flowing the boost pressure it can supply to the engine drops dramatically.
Boost has a large impact on the onset of valve bounce.
With 19 psi boost at 6500 rpm you may experience the same fate as Jimbo.
You will find out soon
Cheers
I had no problem holding 20psi at 7200rpm (turbo took a beating mind you! lol), but 20psi with a .36 housing is a lot less flow than 20psi using a .48.
same here, when i was only running 240-250 i could walk it up to the rev limit of 6500 without any problem
we was looking at 280bhp at 6500 and it would not have it
soon as the new springs went in it was fine, was going to have a look at 7k but it was just falling off torque wise at 6500 so thought theres no point
you may run into the same but its a easy job to do
we was looking at 280bhp at 6500 and it would not have it
soon as the new springs went in it was fine, was going to have a look at 7k but it was just falling off torque wise at 6500 so thought theres no point
you may run into the same but its a easy job to do
27-06-2011, 01:11 PM
#54
PassionFord Post Troll
Running 7.8k soft cut, 8k hard cut on standard ford springs! And obviously not relying on the ford tacho as it only goes to 7. Running a newman solid and not had any issues with the springs
27-06-2011, 01:42 PM
#55
Too many posts.. I need a life!!
I forgot you were using that tiny .36 exhaust housing.
Usually the turbo compressor will run out of flow before the exhaust housing becomes
highly restrictive. However, with the .36, the exhaust housing is the bottleneck!
Your back pressure must have been 50 or 60 psi at 20 psi boost at 7200 rpm.
27-06-2011, 01:43 PM
#56
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There is much more to a valve spring than its "rated" pressures.
How many engine builders measure the installed spring height, and then
measure the actual spring pressure at that installed height?
I bet not many!
Checking springs with compressed air is not really a valid test - all it does is check for a bad valve grind job.
That is why some engines rev much more than other engines with the same springs.
Different installed heights.
Just my opinions
How many engine builders measure the installed spring height, and then
measure the actual spring pressure at that installed height?
I bet not many!
Checking springs with compressed air is not really a valid test - all it does is check for a bad valve grind job.
That is why some engines rev much more than other engines with the same springs.
Different installed heights.
Just my opinions
My pressure test was a simple high pressure test to see if the valves would lift of the seats more than anything. It's difficult to test much more without the relevant tools unfortunately.
28-06-2011, 07:26 AM
#61
PassionFord Post Troll
I know im not allowed in here but surely its still fairly relevant? Or does boost pressure have 'that' much of an effect on the springs handling that it's irrelavent?
28-06-2011, 07:50 AM
#62
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29-06-2011, 08:12 AM
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Hi,
anybody ever tried a 0.36 exhaust housing with a 60trim compressor from a 4x4 sierra?
would be interessted if the compressor wheel is to big for the small exhaust side and if the turbo starts to surge?
regarding the turbo technics stage 2. i have one at home and it has a 50 trim. do they also build them as a 55 trim?
anybody ever tried a 0.36 exhaust housing with a 60trim compressor from a 4x4 sierra?
would be interessted if the compressor wheel is to big for the small exhaust side and if the turbo starts to surge?
regarding the turbo technics stage 2. i have one at home and it has a 50 trim. do they also build them as a 55 trim?
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