2016 race dates and car changes

[Big Steve - Raider]

Ooooaaaarrrrrr

You're lucky I'm only from Peterborough @TNT Andy so I can understand your Norfolk'n'chance accent.. :bv:

 

[TNT Andy]

You're lucky I'm only from Peterborough @TNT Andy so I can understand your Norfolk'n'chance accent.. :bv:

LOL - Steve - I'm From Rochdale, and never, ever been accused of being a carrot cruncher from Norfak matey. Get yer ears checked.

Ow Doo! - hello
Eye - meaning yes
t' - meaning to the - ie i'm going t' pub
up ditter - I'll leave that to you

that more me.

oh and
I've not seen Fluffy in ages - I have a small human

 

[Clarkey]

Do a cylinder leakage test first Dave before taking engine out.

CTM wanted it back mate.

I disagree with everyone because I'm busy running up the road with a straw in my mouth..

LOL ,like it Steve..... how far did you get ?

Taking the engine to CTM tomorrow to be stripped and inspected.
We will find the results of blocking up your exhausts soon.
Took the manifolds off and number 1 ex is very oily..........rings ?

 

[DaveL485]

I agree to disagree

I don't think back pressure in the exhaust would cause it to die. It'd choke and stall because it can't get rid of exhaust gas but not kill the lump.

I've never heard of a banana in the exhaust destroying an engine either!

 

[TNT Andy]

I agree to disagree

I don't think back pressure in the exhaust would cause it to die. It'd choke and stall because it can't get rid of exhaust gas but not kill the lump.

I've never heard of a banana in the exhaust destroying an engine either!

I disagree to agree

because

race car!

 

[Andyquadra]

CTM wanted it back mate.



LOL ,like it Steve..... how far did you get ?

Taking the engine to CTM tomorrow to be stripped and inspected.
We will find the results of blocking up your exhausts soon.
Took the manifolds off and number 1 ex is very oily..........rings ?

Did CTM build the engine? I've seen a lot of their work on GTT engines and my 21T and its normally very good

 

[Clarkey]

I agree to disagree

I don't think back pressure in the exhaust would cause it to die. It'd choke and stall because it can't get rid of exhaust gas but not kill the lump.

I've never heard of a banana in the exhaust destroying an engine either!

I thought the same , we would lose power until we blew the baffle apart !!
I wouldn't of risked it if I thought we would damage the engine.
Talking to Charlie, more to do with the heat generated that would cause the problems with the valves, rings etc.
Hopefully we will find the answer soon ....

Did CTM build the engine? I've seen a lot of their work on GTT engines and my 21T and its normally very good

Yes , they built this and itmade great numbers, shame we didn't get to give it a good go.
Did feel quick though even with bunged up exhausts

 

[TNT Andy]

Hi Dave - FYI = The only time I blew a set of rings was when I pushed a relatively small turbo way past it's efficiency range and the charge temps must have been off the chart on a relatively small intercooler. This was on track again, it was a small T25 (Something like a Tomcat) and if I remember rightly I had a very inefficient I/C or C/C set up. I've measured charge temps for years now and for a long time I had run many configurations including Strapped standard I/C's, Frontera, 2wd Cossie and PWR Charge coolers, and none of them were getting the temps below 60 Deg C on track at 20-24 psi on a hot day. This was always on a hard pushed smaller turbo on a well tuned set-up. It was only until I started looking into turbo Efficiency that I really started to get to grips with it and my T28 was great as it never got too hot. I whacked a massive cooler on just to be sure as it's a tried and tested practice, I'm sure a Turbo running well within it's map would be fine on a smaller cooler though.

BTW - I was on Snetterton at the time and was being spanked by some deisel Skoda's which I just wasn't having - cranked up the boost, rinced them and set on fire - A great moment in Fluffy history.

 

[Clarkey]

Hi Dave - FYI = The only time I blew a set of rings was when I pushed a relatively small turbo way past it's efficiency range and the charge temps must have been off the chart on a relatively small intercooler.

Good point Andy, pushing turbos past their efficiency certainly causes heat problems.
Silverstone was a freezing cold day and we only managed 3/4 of a lap before she started struggling.
I doubt the temps would have been that high in that time.

 

[andybond]

As an aside does the adaptronic data log?

 

[Andyquadra]

As an aside does the adaptronic data log?

ye, but its depends on which one you have

 

[DaveL485]

As an aside does the adaptronic data log?

They all do if attached to (a device) that records the data, ie a laptop or android device.

Good point Andy, pushing turbos past their efficiency certainly causes heat problems.

Its not just temperature, well, it is, but high charge temp isnt just "high charge temp", its about air density too. The hotter it is the less air there is in a given amount of charge. A turbo doesnt increase the flow into the engine as much as it increases the amount of air in the same actual volume of charge. At the top end of a turbo's range you hit the point where thermal expansion surpasses the compression and you get LESS burnable air in your cylinder volume despite increasing boost pressure.

To demonstrate how big this effect is, sink an empty 2L pop bottle in a bowl of hot water. Don't fill it, just submerge to the neck in hot water and let the air inside the bottle warm up. After a couple of minutes screw the cap on tight and pull the bottle out of the water (still empty), dry it and put it in the freezer or fridge. Give it ten minutes to chill down and see how the volume (charge) in the bottle reduces in space so much it sucks the bottle in.

The amount of air in the bottle never changes. Imagine that hot or cold air in your charge pipes.

 

[Clarkey]

Got the call today from CTM, they were taking a look at the engine.
Relief as everything looks ok apart from a couple of bent pushrods.
Got to take some spare pushrods and followers on Monday, so will find out more then.
Running out of the longer pushrods now so looking into getting some made.
I have some longer adjusters for the "standard" rods if I get stuck..

 

[Mark Davis]

Good to hear Clarkey, hopefully it's alright.

Question from a noob, why do run longer pushrods ?

 

[Clarkey]

Good to hear Clarkey, hopefully it's alright.

Question from a noob, why do run longer pushrods ?

Thanks Mark

With the uprated cams and standard pushrods 170mm, the adjusters are on the limit with the locking nut when setting the clearances.
The longer pushrods 175mm give the locking nut more thread on the adjuster.
Hope that makes sense

 

[DaveL485]

Good to hear Clarkey, hopefully it's alright.

Question from a noob, why do run longer pushrods ?

I assume Clarkey is running a recut cam. When a cam is cut from an OE one material is removed from the back of the lobes, so the tappet can be adjusted further down and therefore the original lobe tip extends further relative to the adjusted tappet position giving more lift. This sucks up the adjustment of the tappet so with a longer pushrod it compensates.
The alternative is a billet cam, which is a bespoke profile cut to spec from a full blank. These are, as you might guess, hugely expensive. I could have bought five recut cams for the price of my billet one and its matching pulley, but I had to as my head was an NA head and I couldnt recut the OE cam anywhere near what I wanted.

 

[Brigsy]

Get some custom push rods made up, Glen Robson is the man to see about this. He was forever bending them on his old c1j when hitting the hard cut limiter.

I have a billet cam - adjusters are still pretty much maxed out.

 

[Clarkey]

Get some custom push rods made up, Glen Robson is the man to see about this. He was forever bending them on his old c1j when hitting the hard cut limiter.

I have a billet cam - adjusters are still pretty much maxed out.

Thanks Jon, I spoke to Glen the other day and told me all about the pushrods.
He also had them made 5mm longer than standard.

I only have a 6 left of the longer pushrods, have bent a few
I did have some longer adjusters made to use with the standard pushrods if I get stuck.
The custom pushrods may also be the answer as Glen never bent another even at 8500rpm.....

 

[Clarkey]

Picked the engine from CTM Saturday, been away on a couple of holidays so not much been happening.
Engine had a complete strip down to check everything else, all ok, which was a relief so only damage was the pushrods.
CTM have put a couple of breathers in, the original sump breather has been changed to 15mm and another breather on the front of block.
Looking into Titanium pushrods this week.
Made a start today putting bits back on engine, pretty much ready to go back in.
Will be adding a 300mm silencer to exhaust to avoid any future noise issues, not that you here me above the throttle body brigade!
Hope to have all back in this weekend.
Thruxton 3rd July..........

 

[andybond]

I might have a contact who should be able to do you the Ti pushrods.
Could they be made of inconel instead ?