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by bigaldart
Sun Jan 19, 2020 12:18 am
Forum: Engines Area
Topic: Exhaust manifold temperature.
Replies: 10
Views: 509

Re: Exhaust manifold temperature.

If you haven't found a solution then forget idle temperatures, if you even them up you will often find big differences at higher rpm. It is far more important to have equal temperatures at the rpm you run regularly.
by bigaldart
Sat Jan 18, 2020 8:42 pm
Forum: Engines Area
Topic: Failure of stock cast 3.9/4.0 pistons at higher RPM? Or Forged options?
Replies: 4
Views: 254

Re: Failure of stock cast 3.9/4.0 pistons at higher RPM? Or Forged options?

We run 6^ Scat Chevy Rods, narrowed to suit, also need to narrow Chevy bearings to suit. Keith Black Ikon forged pistons built for a stock stroke, stock bore Chevy 305. Piston is 3 thou out of the bore and is flat topped. However we run a 40 thou thick head gasket. This gives around 11-1 compression...
by bigaldart
Tue Dec 18, 2018 8:37 pm
Forum: Engines Area
Topic: Chevy 305 pistons in Rover v8
Replies: 2
Views: 653

Re: Chevy 305 pistons in Rover v8

They don't line up at all. We run these pistons in a dragster, for or purposes it's no issue as we don't need valve reliefs with a blower cam, I am sure they make a dished forged piston in the same size. You could then put in any reliefs you need to suit your application. The stock 305 pistons on a ...
by bigaldart
Sun Dec 11, 2016 11:14 am
Forum: Engines Area
Topic: 4.6 Build.. Spec ideas?
Replies: 89
Views: 15518

Tony's pistons are custom, however I have been playing with the numbers for a 5.7 rod engine based on a 4.6 as we have two sets of 5.7 rods available. This will be the rod journals turned down to 2" and offset by 0.050" in the process. With a Keith Black Ikon 305 Chevy forged piston, the stock Chevy...
by bigaldart
Fri Nov 25, 2016 2:03 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: ARP Bolt Torque Settings
Replies: 12
Views: 2202

With ARP studs we have always used 70 ft/lbs and have had zero issues, this is with up to 20 lbs of boost and almost 12-1 compression so I doubt you need more than that on a street application. Of course the bottom row is only torqued to around 25 ft/lbs if you are using them.

Alan
by bigaldart
Sat Nov 19, 2016 2:59 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: constant popping and banging on idle and revving
Replies: 3
Views: 1319

Popping in exhaust or through intake?
by bigaldart
Sun Oct 09, 2016 1:01 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: Cool air for the 3.5 V8 in a Marcos
Replies: 6
Views: 1708

The ran air effect at road speeds is insignificant, you will be lucky to see 1/2 lb and then only over 100 mph. As you say the main benefit is that the carb sees the cooler air outside of the engine bay, this is what makes it worthwhile. Just jet the carb as normal and don't worry about any boost re...
by bigaldart
Wed Oct 05, 2016 6:23 am
Forum: Engines Area
Topic: Rover V8 liner replacement 3.5 - 3.9
Replies: 10
Views: 2986

Our machine shop always machines liners out. We just had three oversize liners fitted due to a major overheat. I can't see the liners falling out from just heating the block and I seem to recall the blocks were heat treated during manufacture. If this is the case then the heat treat will be lost at ...
by bigaldart
Mon Sep 26, 2016 5:06 pm
Forum: Engines Area
Topic: Fretting on main caps. Scrap or cross bolt?
Replies: 7
Views: 1767

The major problem with fretting is that the transfer of metal can result in inconsistent positioning of the mains when removing and refitting. A stud kit alone will not prevent this, we have fretting on our non-crossbolted engines and always use studs at 90 lb/ft torque. One tip from American drag r...
by bigaldart
Thu Sep 08, 2016 12:04 am
Forum: Engines Area
Topic: Discovery 2 4.6 v8 build help!
Replies: 45
Views: 8364

If you have a cam that allows early cylinder filling like a torque oriented camshaft you need a lower compression, if you have a high revving engine you can use a power oriented camshaft with more duration, you are correct in thinking that a torque camshaft will not work with high compression With h...
by bigaldart
Wed Jun 08, 2016 6:24 pm
Forum: Engines Area
Topic: Cork or rubber?
Replies: 9
Views: 1997

Like Pel we have the rocker covers off very frequently. We use cork gaskets and the same method of securing them, never a problem. When we melted pistons the valley gasket failed but the rocker cover seal remained intact.

Cork for me everytime.

Alan
by bigaldart
Sat Jun 04, 2016 1:52 pm
Forum: 1/4 Mile Times
Topic: 2nd outing for LS Minor
Replies: 25
Views: 8239

Love the car, must be real fun on the road. The bigger front tyres will have a noticeable influence on times. More rotating unsprung weight and a longer rollout will affect ET's. The slight change in mph is probably accounted for by the air on the day. Even on our car the times can change 2/10ths or...
by bigaldart
Tue May 31, 2016 7:36 pm
Forum: 1/4 Mile Times
Topic: New season for Daddy Cool
Replies: 14
Views: 2928

Pit bitching for Mike?

Alan
by bigaldart
Tue May 31, 2016 7:32 pm
Forum: 1/4 Mile Times
Topic: New season for Daddy Cool
Replies: 14
Views: 2928

Quite possible the entire county of Warwickshire would seen a rain fall of Rover V8 parts!

Alan
by bigaldart
Tue May 31, 2016 7:29 pm
Forum: 1/4 Mile Times
Topic: New season for Daddy Cool
Replies: 14
Views: 2928

Never been so happy to be shut down on the line Pel, thats a big for sure

Alan

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