Grose ball valve jets
Posted By : Lindsay Dearing, 10-Aug-2003, 04:34pm
Following my initial query I have done some intensive research on American web sites and have come to the following observations;
1) These ball jet valves are either loved or loathed!
2)They appear to work more efficiently on the older adjustable float SU's.
3)Unleaded petrol and infrequent use can leave deposits on the valve causing it to stick.
Whilst modern petrol does seem to cause an awfiul lot of problems ie. rubber pipe deterioration; loss of volatility etc.
In my case I have retro-fitted the original needle valves. Initially the performance is identical and the idle even better, but I will have to get a few more miles on them until I can draw any profound conclusions. I hope these observations are of use to anyone as I get the impression that no-one knows much about Grose Jets!
1) These ball jet valves are either loved or loathed!
2)They appear to work more efficiently on the older adjustable float SU's.
3)Unleaded petrol and infrequent use can leave deposits on the valve causing it to stick.
Whilst modern petrol does seem to cause an awfiul lot of problems ie. rubber pipe deterioration; loss of volatility etc.
In my case I have retro-fitted the original needle valves. Initially the performance is identical and the idle even better, but I will have to get a few more miles on them until I can draw any profound conclusions. I hope these observations are of use to anyone as I get the impression that no-one knows much about Grose Jets!
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Grose ball valve jets
Posted By : Chris Wilson, 07-Sep-2003, 07:49am
Hi Lindsay,
Any conclusions yet? Reason why I'm askin is that last week I noticed that I was getting more petrol "whiffs" than normal and thought I would invest in a pair of these jets just in case. (I had to replace a lost lower middle manifold clamp and nut anyway and that's best done by taking the carbs off!). Anyway after undoing the nuts for the carbs and then having both carbs, the 2 connecting rods and an alloy heatshield deposit themselves at my feet
I noticed that the fuel smell was maybe coming from the join between the
float chamber lids and the float chambers! Doh! Tightened up said bolts and no more probs! So, I now have a brand new pair of Grose jets but if
there's no advantage in fitting them I guess they'll just stay in the bag!
On a slightly different subject, having fitted a new sports coil, re-fitted a new manifold clamp and tightened up those float chamber lids - I now have a spit that accelerates through the rev range and doesn't back off anymore at the high end of the rev range (faulty coil!), has no more backfiring on deceleration under load (air leaks in manifold?)and no more smelly fumes!! (float chamber lids!)
Regards
Chris
1975 1500