100,000 miles - finally!

[rfisher]

EvoOlli said:

rfisher said:

How does a bit of the cat get sucked into the engine and why isn't that covered by Power's warranty?

High overlap of valves and an (abrupt) release of the throttle at higher RPMs -> Underpressure in the exhaust...if the cats were damaged before by excessive fuel / rich mixture it can suck in parts of the ceramic cat.

Why should a warranty on the engine cover such failure ?

Don't want to detract from the OP's admirable devotion to the cause (well done again OP), but .......

Who's to say that the cat didn't destruct as a result of the not inconsiderable forces sucking down the exhaust while the engine blew itself up?

I've not heard of m(any) Sp6 engines sucking bits of their cats into the engine.

Is this a common event?

Should all Sp6 owners have the cats replaced after a certain time?

Edited by rfisher on Tuesday 11th February 17:45

[mart 63]

ALT said:

mart 63 said:

My mistake. He should have said "l paid for both".

I'll try and remember to get you to proofread all my future posts.

[Chim450]

rfisher said:

EvoOlli said:

rfisher said:

How does a bit of the cat get sucked into the engine and why isn't that covered by Power's warranty?

High overlap of valves and an (abrupt) release of the throttle at higher RPMs -> Underpressure in the exhaust...if the cats were damaged before by excessive fuel / rich mixture it can suck in parts of the ceramic cat.

Why should a warranty on the engine cover such failure ?

Don't want to detract from the OP's admirable devotion to the cause (well done again OP), but .......

Who's to say that the cat didn't destruct as a result of the not inconsiderable forces sucking down the exhaust while the engine blew itself up?

I've not heard of m(any) Sp6 engines sucking bits of their cats into the engine.

Is this a common event?

Should all Sp6 owners have the cats replaced after a certain time?

Edited by rfisher on Tuesday 11th February 17:45

I removed my cats a few years ago. The honeycomb was in a really poor state, with bits falling off all over the place. It was entirely feasible that bits could have been sucked back into the engine.

[EvoOlli]

rfisher said:

Is this a common event?

No, it's fortunately not a common event, but it can happen. It happened on newer Aston Martin V12 Engines too...

But what happens to the Speed6 Engine very often is a rich mixture or fuel into the exhaust, because the MBE is not very sophisticated. And then the Cats will be destroyed. A solution would be cat replacements or, as far as i know, metallic cats. Maybe speaking to Dom would clarify ?

[glow worm]

I thought they are metallic , at least my melted one looked metallic

Edited by glow worm on Wednesday 12th February 09:02

[nawarne]

glow worm said:

I thought they are metallic , at least my melted one looked metallic

Edited by glow worm on Wednesday 12th February 09:02

They are indeed metallic!
The matrix is made primarily of Platinum.....This explains why there has been a surge of cat' thefts in various areas, where the catalysts fetch a good price on the scrap metal market.

….All those pops and bangs we like to hear, CAN blow out the matrix....It's a mini explosion caused by unburnt fuel being ignited by a hot catalyst. The detritus can be sucked back into the engine.

Nick

[ALT]

Thanks for all the additional information regarding the cats, I'm not that mechanically-minded so have learned a bit reading your posts.

I was told by TVR Power that it was a "freak event", this was back in 2011 so I've no idea if it's become more common since.

[glow worm]

The melted cat was off the Sagaris I used to own. The cats were taken off when I bought the car as 2nd owner , it had only covered 7,000 miles in 9 years . My TVR guru thought the most likely culprit was the MOT testing station , revving the car to get it up to temperature quickly for the emission tests.

[shorts!]

Welcome to the high mileage club.
And the daily driver club.
Sadly I had to relinquish my membership of the latter 3 or 4 years ago when I bought a little run around to cope better with the almost permanent traffic jams on and within the M25. I did 20 years of driving a TVR as my only car prior to that.
Still a member of the high mileage club though.

[Englishman]

Another cat destroyed by excess fuel in the exhaust. This time the missing bits went into the exhaust and caused a partial block. Eventually they shot out of the back under hard acceleration!