Solid v Hydraulic lifters

I had mine 'done' locally and it came back as noisy as ever, took the car to V8 for another reason where they did the job properly. Quiet as a mouse now

shpub said:

mickypee said: shpub said, The 520 engine has them and is producing at 6500 about 200 bhp more than a standard GRiff 500. Really?? Yep.

Really??? Griff 500 at 6500rpm - 250bhp so the 520 produces in excess of 450?

What revs is max power developed at? 5750? Surely it can't fall by more than 20% in 750 revs? For it to be 200bhp less than the 520 the torque would have to fall by a half in 750 revs

Must admit the power had dropped off a lot, must do a RR session soon

Marlon said:

[quote] I'm using the twin ACT plenum and V8D trumpets. Standard air flow meter and filter. Mapping has been done on a RR by Mark Adams (twice) - second time with bigger injectors added as Mark said it was dangerously running out of injector duration at the top end... Very smooth delivery (idles cleanly at 1k RPM, pulls from any speed in any gear), loadsd of torque from low-down, but runs out of power way before 6,000 RPM. Cylinder heads are standard 500.

Maybe a larger airflowmeter will help, but I guess Mark would have told you. On the other hand, what kind of power is your engine delivering? Should be around 300 bhp and 330 lbs. with your setup. Could well be that 5,400 rpm is "normal" for max. power. I wouldn't know where the max power level of my engine is, just that it won't stop pulling until well over 6,000 rpm and that it's quite fast. It seems strongest between 3,000 and 5,500 rpm. 6,800 rpm seems very high and also hazerdous for the engine. Myself I rarely go over 6,000 rpm and normally I stay below 5,500 (like Steve once taught me).

Just looked at the V8D site. A similar setup has 336 bhp at around 5,400 rpm so indeed it is a "normal" level.

>> Edited by gerjo on Tuesday 9th December 19:49

HarryW said:

Steve is that the same as the steel rocker gear V8D do . Just wondering as these were fitted to mine as part of the rebuild. Shame you can't see them if they are bling bling Harry

I doubt it. They cost about £1000 for the set.... But they are colour anodised which you can just see through the oil filler cap...

Marlon said:

shpub said: The solid lifter need adjusting/chceking regularly as failure to do so can result in cam shaft and rocker wear. How often is "regularly" Steve? V8 Developments recommend 6,000 miles, but other people have said that 15,000 is more standard for a fairly mild solid lifter cam... Had the P404 for over 4,000 miles and there's no audible sign that the tappets need adjusting... Does it vary that much from one cam to the next?

I think it does. I have heard mileages as low as 300 to as high as 10000 so I think it is dependent on what has been used exactly. Never done it on the 520 engine because it stays quiet and it gets stripped and rebuilt every year ish so never had to do it.

I think it is just something to be aware off and periodically check. Playing with engines is not cheap and a bit of investment to make sure they are 100% OK is well worth it.

Steve, have you fitted the 8 throttle set up yet ? i'm curious as to what size you went / are going for.
Tim

2 sheds said:

Steve, have you fitted the 8 throttle set up yet ? i'm curious as to what size you went / are going for. Tim

The engine has come back from John with the multi throttle setup. Not totally sure what John did in the end but according to the bill, he went for 50 mm throttle bodies and a new inlet manifold design, fuel rails and everything. The old injectors were struggling with fuel delivery so I now have 8 new big firehose injectors instead. He's moved the rev limit up a bit to around 7000 if I want it but he thinks that 6600 to 6700 will be enough as it is still putting out 360/370 bhp. The actual figures are a bit low mainly due to very high air intake temperatures so getting the engine into the car and some cold air should free some more horses. The best thing is a virtually flat torque curve from 2900 to 6600 with a minimum of around 350 lb/ft . Ho hum....

The multiple throttles seem to have smoothed out the power delivery as well as giving another hike. I must admit I can't wait till the beast is back on the road.

Sounds good, i have been doing some development work with this kind of set up, clearly you have more power to come.
Tim