400HC Camshaft
Discussion
OK i am new to this forum, but have been reading it on and off for a while now with great interest,
Now i am pretty sure i have a worn camshaft as the car is on 68k and there is a loud clicking noise on tickover, which is not caused by an exhaust manifold leak.
I know just because it says 400HC on the engine it does not mean it has a high lift cam fitted,
But if it has got a TVR435R/M fitted.?
What i would like to know is what is the equivalent cam available as a replacement WITHOUT resorting to ECU reprogramming or add on's.I am an old git and am not looking for Max BHP or Torque just the power it came with new or close to it.
Any help you guys can provide would be greatly appreciated.
Now i am pretty sure i have a worn camshaft as the car is on 68k and there is a loud clicking noise on tickover, which is not caused by an exhaust manifold leak.
I know just because it says 400HC on the engine it does not mean it has a high lift cam fitted,
But if it has got a TVR435R/M fitted.?
What i would like to know is what is the equivalent cam available as a replacement WITHOUT resorting to ECU reprogramming or add on's.I am an old git and am not looking for Max BHP or Torque just the power it came with new or close to it.
Any help you guys can provide would be greatly appreciated.
Plus 3 but if your still on 14CUX its not going to be mapped like your factory cam ,don`t know how flexible the 14CUX is .
When i went from the standard 4l cam to a MC1 cam which is the one below the stealth i had all sorts of problems so in the end i fitted an adjustable fuel regulator to componsate for the lack of fuel required.
Blitz will explain..
Its like not being able to change the jet ,needles etc in a carb and expect it to run correctly after upgrades!
When i went from the standard 4l cam to a MC1 cam which is the one below the stealth i had all sorts of problems so in the end i fitted an adjustable fuel regulator to componsate for the lack of fuel required.
Blitz will explain..
Its like not being able to change the jet ,needles etc in a carb and expect it to run correctly after upgrades!
Don't let he above comments from SILICONEKID340HP put you off cogrog.
In simple terms the internal combustion engine is effectively just an air pump.
Sticking with the pump analogy; changing the cam profile will change characteristics of the pump.
If your current cam is worn, a new cam will have a big impact on improving the pump's efficiency.
Because the lobes are opening the valves a fresh cam will open the valves more & keep them open for longer, this allows more air & fuel into the combustion chamber & improves the ability for the exhaust gasses to be pumped out on the exhaust stroke.
Forget all the fancy profiles for a minute, simply replacing a worn cam with a new one is therefore one of best things you can do to improve the performance of your engine.
It's always been like that.
The 14CUX system is both adaptive (to some degree it learns your engine's requirements) and is designed specifically to compensate for different levels of air mass passing over the "hot-wire" mass airflow sensor.
The ECU takes 90% of it's information from the air flow meter which is upstream from the pump.
So, improve the efficiency of the pump downstream & the signal to the ECU from the mass airflow sensor will change accordingly.
The 14CUX ECU has enough processing range to translate the changes effected by a mild cam change into an accurate & appropriate delivery of fuel required by your now more efficient pump (the engine).
As long as you stick to one of the proven tried & tested cam profiles (which in reality are all quite mild), the 14CUX system will happily compensate all on it's own.
The 14CUX is actually quite a cunning system when you start to understand how it works.
To give you a real world example, on the recommendation of Rob Roberson at V8 Developments I went for their Stealth cam, this is one step up from their MC1 profile.
I had some initial concerns that idle & driveability would be effected but decided to take the advice of those more experienced that myself.
Me to Rob: "MC1 or Stealth, I want a smooth all round driver not a race engine"
Rob: "Go with the Stealth"
Me: "I really don't want an undrivable cammy engine"
Rob: "Dont worry it'll be fine"
Me: "Ok, I'll trust your experience, lets go with the Stealth"
In reality from what I could tell the idle & driveability were completely unaffected by the Stealth cam so I was pleased I went with the slightly more progressive Stealth profile over the MC1.
However, what changed was the car's ability to breath & this improved breathing translated directly into significantly better performance, the type of performance gain you notice on the road in real world overtaking situations.
Like I say, if your cam is worn, replacing it is one of the best things you can do, just don't pick a really lumpy profile & you won't regret it.
As you may have guessed already I can thoroughly recommend the Stealth from V8 Developments.
As long as everything is working correctly the old 14CUX system will be happy to sort the fuelling out for you all on it's own, and at no cost
In simple terms the internal combustion engine is effectively just an air pump.
Sticking with the pump analogy; changing the cam profile will change characteristics of the pump.
If your current cam is worn, a new cam will have a big impact on improving the pump's efficiency.
Because the lobes are opening the valves a fresh cam will open the valves more & keep them open for longer, this allows more air & fuel into the combustion chamber & improves the ability for the exhaust gasses to be pumped out on the exhaust stroke.
Forget all the fancy profiles for a minute, simply replacing a worn cam with a new one is therefore one of best things you can do to improve the performance of your engine.
It's always been like that.
The 14CUX system is both adaptive (to some degree it learns your engine's requirements) and is designed specifically to compensate for different levels of air mass passing over the "hot-wire" mass airflow sensor.
The ECU takes 90% of it's information from the air flow meter which is upstream from the pump.
So, improve the efficiency of the pump downstream & the signal to the ECU from the mass airflow sensor will change accordingly.
The 14CUX ECU has enough processing range to translate the changes effected by a mild cam change into an accurate & appropriate delivery of fuel required by your now more efficient pump (the engine).
As long as you stick to one of the proven tried & tested cam profiles (which in reality are all quite mild), the 14CUX system will happily compensate all on it's own.
The 14CUX is actually quite a cunning system when you start to understand how it works.
To give you a real world example, on the recommendation of Rob Roberson at V8 Developments I went for their Stealth cam, this is one step up from their MC1 profile.
I had some initial concerns that idle & driveability would be effected but decided to take the advice of those more experienced that myself.
Me to Rob: "MC1 or Stealth, I want a smooth all round driver not a race engine"
Rob: "Go with the Stealth"
Me: "I really don't want an undrivable cammy engine"
Rob: "Dont worry it'll be fine"
Me: "Ok, I'll trust your experience, lets go with the Stealth"
In reality from what I could tell the idle & driveability were completely unaffected by the Stealth cam so I was pleased I went with the slightly more progressive Stealth profile over the MC1.
However, what changed was the car's ability to breath & this improved breathing translated directly into significantly better performance, the type of performance gain you notice on the road in real world overtaking situations.
Like I say, if your cam is worn, replacing it is one of the best things you can do, just don't pick a really lumpy profile & you won't regret it.
As you may have guessed already I can thoroughly recommend the Stealth from V8 Developments.
As long as everything is working correctly the old 14CUX system will be happy to sort the fuelling out for you all on it's own, and at no cost
Edited by ChimpanLucky on Monday 30th April 10:05
Bassfiend said:
Tempted by a stealth but my clanking gonads are telling me not to be a pussy and go for something wilder. 
Phil
I`d be very careful on a road car, might sound like a good idea but in practice driving something that will be shunty and lumpy low down, would in my opinion soon become a pain.Phil
One of the joys of a V8, in my mind, is the ability to just lazilly and effortlessly burble around at low revs.
With a carb you would be alright but with that plenum think carefully.
I would just like to thank everyone who has answered my question. I think i am probably be going for a stealth
As I will in all probability be doing the work myself if it ever stops raining, maybe when i strip down i'll find the rockers are shot not the camshaft. Two hopes Bob Hope & no Hope
Again many thanks i'll let you know what the outcome is.
Regards
Rog
As I will in all probability be doing the work myself if it ever stops raining, maybe when i strip down i'll find the rockers are shot not the camshaft. Two hopes Bob Hope & no Hope
Again many thanks i'll let you know what the outcome is.
Regards
Rog
Gassing Station | Chimaera | Top of Page | What's New | My Stuff