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Isn't that what I said earlier in thread? The valves simply shut off the inside pipes therefore sound escapes from 2 out of 4 pipes. Crude but simple
GS Larini back boxes
- Thread starter Panicracing
- Start date
Isn't that what I said earlier in thread? The valves simply shut off the inside pipes therefore sound escapes from 2 out of 4 pipes. Crude but simple
mjheathcote
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Yes, just trying to change 'At a guess looking at the pictures it looks like' to 'Yes they are...'!
mjheathcote
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Surprised at that!
Looking for valves to retrofit, the pipes measure 1-7/8", just less than 48mm outside diameter.
I am assuming they will have fitted 2" (near enough 51mm) valves and used plenty of wire.
Cast stainless steel valves look to be available.
Out of interest, on the GS, are the valves normally open or normally closed, the state with no vacuum applied?
mjheathcote
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Do you have a part number? and price, eeek Aston prices!
....are these to replace GS OEM valves (not stainless?)....or larini valves? Not sure what you have fitted.
IMO the Larini rear boxes are not very sophisticated. My car had the valved rear boxes fitted when I bought it a few years ago, so probably one of the very first produced. I noticed a terrible buzzing sound from the boxes when not in Sport mode, it sounded awful. ADG supplied my car and dealt with the issue directly with Larini - the manufacturer admitted that the early valves/solenoid weren't great and were prepared to try to sort my car. The boxes were removed; Larini cut them open, replaced the valves and re-welded the boxes. Sadly the issue remains and sounds really buzzy and cr@p on the extremely rare times my car is not in Sport mode. Coupled with the boominess apparent at certain revs/speeds, this experience really made me question the quality an alleged R&D of Larini products. I eventually bought the remainder of the system from Larini (via Noor at Torenno) and am very happy with the quality and fit of the sports cats, h-pipe etc. The car is still boomy and I've learned to accept it (or drive faster!). I have a load of lightweight Dynamat to fit to the entire floor at some point to hopefully improve noise levels in the cabin.
spkennyuk
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Larini , tubi, quicksilver i think they all drone to some extent. Its just a matter of at what rev range it appears and how much time your cars spend in that rev range. Dropping a cog to get to increase the revs past the drone spot helps. I have works planned to solve the drone on mine which appears at the worst possible rev range.
mjheathcote
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Don't want any buzziness, that is probably caused by the butterfly stem of the valve rattling in its loose (read that as cheap) bushing at a guess.
Yes like many, I do have a drone at certain low revs, that I live with, either by changing a gear or simply crack opening the window that releases the amplification in the cabin.
Panicracing
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Valves are made by helical technology and I would say they are pretty well made. A lot better than the OE on the GS. Easy to find on Google.
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mjheathcote
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Thanks for that, appreciated.
mjheathcote
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Where did you buy your replacements Arne? are they Helical Tech as original and still mild steel?
I phoned Helical Tech yesterday and they said they would ring me back, which they have not as yet, so I also pinged them an email too.
Fat Arnie
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Mike,
I had a work appt nr Lytham where they are.
They are a difficult company to work with - they are not geared up for the consumer. I had to get an order raised, pay by bank transfer and go to Lytham to collect. Cost IIRC was £55 ea + VAT
The man who can help is:
Andrew Gravner
Actuator Engineering Manager & Technical Sales
T: +44 (0)1253 530240 (Desk)
M: +44 07720 640059 (Mobile)
E: andy.gravner@helical-technology.co.uk
Peter,
Loz lives in Milton Keynes, so not really near the beach. He fitted the Larinis, so the rust on those actuators must have come since then. It also lived in Glasgow for a year between his and my ownership. Perhaps it was exposed to lots of road slat up there.
Worryingly, that was not the worst corrosion on my car. Fortunately its all on removable/replaceable bits so soon it will be like new again.
I had a work appt nr Lytham where they are.
They are a difficult company to work with - they are not geared up for the consumer. I had to get an order raised, pay by bank transfer and go to Lytham to collect. Cost IIRC was £55 ea + VAT
The man who can help is:
Andrew Gravner
Actuator Engineering Manager & Technical Sales
T: +44 (0)1253 530240 (Desk)
M: +44 07720 640059 (Mobile)
E: andy.gravner@helical-technology.co.uk
Peter,
Loz lives in Milton Keynes, so not really near the beach. He fitted the Larinis, so the rust on those actuators must have come since then. It also lived in Glasgow for a year between his and my ownership. Perhaps it was exposed to lots of road slat up there.
Worryingly, that was not the worst corrosion on my car. Fortunately its all on removable/replaceable bits so soon it will be like new again.
mjheathcote
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Thanks Arnie.
Panicracing
Junior Member
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These are stainless steel as checked with magnet
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Panicracing
Junior Member
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Not yet. Just finishing some jobs on the front end then onto the back. Will update when fitted.
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