well its out and now in!!

marccleave · Apr 15, 2014

Why use a 4.6?

If it were me then the reasons I would use a 3.5 is because I already have a spare engine and also for me the originality factor, still using the original engine but with a supercharger.

If I could get hold of one I'd totally put in a 2L supercharged Rover V8 that TVR did.

Its a 3.5 with a reduced stroke, so its got a 88.9mm bore with stroke of 40.25mm. 230 bhp at 6,200 rpm and 266 Nm at 3,700 rpm. So a bit high for a 2 tonne RRC.

TVR V8S 2000cc

I think J E Developments do a 63mm stroke crank. Would take a 3.5 down to a 3.1 if you machined it to fit and got correct sized rods.

Mr Noisy · Apr 15, 2014

Zen

Thanks for reply

Interesting what you say about CR

10.5:1 on boost particularly, many online saying low CR is required! Which is what I thought would be the case

Don't want to build a sluggish low CR engine if I don't have to...

Regards 3.5, I have a great block that won't cost me, all large bore stuff is more expensive

Would like to find a slipped liner 4.6 then I can have heads, sell crank and pistons etc

Tbh just fancy doing a 3.5 aswell, kinda what Marc says but also just cos I know they're good for it

It's mainly cos small bore stuff is cheap hopefully

Had my eyes on some 8.13:1 +20 pistons but they might not be +20 now so got to wait and see

But now I'm not sure if 8.13 is better

Guess lower CR = more boost but then probably worse mpg!

Mr Noisy · Apr 15, 2014

There was a 3.0 rover on eBay few months back that had been linered down, was interesting but didn't really see the point

marccleave · Apr 16, 2014

How did I miss that?! I would have totally snapped that up! Argh!

Need more information on that. If it had smaller liners then that would need to go from an 88.9mm bore down to 82mm. And pistons etc to fit of course.

I think a small displacement V8/10/16 appeals to me because everyone always wants a larger displacement, lots more power etc.

What about a BRM V16?! Supercharged 1.5 litre V16 for F1. Designed in 1947 and produced 600 bhp at 12,000 rpm.

Totally useless in a Land-Rover of course but I go all bendy at the legs just thinking about things like that.

Dr_evil · Apr 16, 2014

It was the TVR 3L block, had been up for sale a few times

If you want a small displacement brit V8 get a 2.5 daimler hemi

Displacement means low end torque

and thats the fun stuff!

marccleave · Apr 16, 2014

My google-fu is failing me. I can't find any reference to TVR doing a 3L version of a Rover V8... ?

Zen, are you deciding to go ms or see if you can at least get this running with gems?

Dr_evil · Apr 16, 2014

Thats what it said in the advert, no idea if it was true or not

Mr Noisy · Apr 16, 2014

It had really thick liners like 10mm thick and custom pistons.

zen · Apr 16, 2014

but if liners are too thick it wont cool??water jacket just wont do feck all??

anyway..as doc says..2.5 damilar..all been done yrs ago..and i just dont see the point in a small v8 in a 2 ton motor..

AND..getting it running with gems...thay way i can sus out all the gearbox functions, ie does autobox talk via data or just gnd/high for torque reduction request, if data what is it?/whats the torque output data sent to autobox?etc..
this way i can get the megasquirt setup to emulate the gems ecu re gearbox data..

once on ms i can easy sell standalone gems ecu i suspect..

zen · Apr 16, 2014

Mr Noisy said:
Zen

Thanks for reply

Interesting what you say about CR

10.5:1 on boost particularly, many online saying low CR is required! Which is what I thought would be the case

Don't want to build a sluggish low CR engine if I don't have to...

Regards 3.5, I have a great block that won't cost me, all large bore stuff is more expensive

Would like to find a slipped liner 4.6 then I can have heads, sell crank and pistons etc

Tbh just fancy doing a 3.5 aswell, kinda what Marc says but also just cos I know they're good for it

It's mainly cos small bore stuff is cheap hopefully

Had my eyes on some 8.13:1 +20 pistons but they might not be +20 now so got to wait and see

But now I'm not sure if 8.13 is better

Guess lower CR = more boost but then probably worse mpg!

if you gonna use ms then you can use silly high cr..install knock sensors, meth/water injection and have all the advantages of high cr when not on boost..
low cr was for non ecu carbed old school stuff, not needed now..

ok to run 2 bar boost then 10.5 cr is too high,

oh and dont forget lpg...108 ron..up the cr even more!!

Mr Noisy · Apr 16, 2014

You're right, knock sensors are the way forward, even if we could use them for tuning.

I'll do some reading about it, cheers

zen · Apr 17, 2014

i wired my knock sensors up to the line level in on my car hifi...]thay was for tuning..i run knock sensor nodule into the ms3 for everyday use, with big bright led on dash as well as ecu retardation...led lets me know if i need to tweek tuning or got crap fuel in..

the hifi knock sensor for tuning is excellent..(if abit noisy!)so should be just your thing!
works atreat..if you aint got sensors then go ebay hunting for some bosch hole in the middle types, just bolt them on to each side of block near to the middle of each bank as poss..though the rv8 block has plenty of unused bolt holes to choise from..

zen · Apr 17, 2014

oh..listening for knock is essential...one cant set up engine without..that an wb o2 sensor..

use the ego correction gauge on ms too...most useful tool on ms for tuning..(assuming you using tuner studio)

Mr Noisy · Apr 17, 2014

Great advice as ever zen, thanks!

Do you use knocksense? Or does ms3 have it built in?

Mr Noisy · Apr 17, 2014

Great advice as ever zen, thanks!

Do you use knocksense? Or does ms3 have it built in?

zen · Apr 19, 2014

Cant remember which unit it is.i will have a look,
But it was external and sold by phil efiextra.
Needed a bit of tinlering to get to work properly.
All the input wires were same colour and no instructions,so one
Didnt know which wire was signal or gnd.

I use it as a saftey net..timing spark table is set up using
Hifi knock sensors,advancing timing till lnock heard then back off
Abit.did this for petrol and lpg using 2 tables
Then re adjustedxfuel tables ,then back to spark etc

Do you run wb ego control?no hope of tuning without really

Oh lpg is so good onboost too..23 btdc at .8bar on petrol
Lpg 28btdc.at 0 bar 38 btdc! ..totally compensates for slow burn of lpg
And hense get same power as petrol
Above settings at 6000rpm on the lexus lump

I do run only shell v power (Nitro plus stupid name 99 ron)
Normal 95 pinks to the point of being undrivable

Mr Noisy · Apr 19, 2014

thanks zen

i do use WB yes, took it out though because i killed a sensor when wading (annoyed) so i now only use WB for tuning

was running it all the time and it was great for EGO adjustment on the fly

zen · Apr 20, 2014

So then you not using afr tables,
Thats a shame cos its rather useful and abit of a waste of ms's abilty
To not use
May i recommend buying a spare..

Mr Noisy · Apr 21, 2014

Yeah not using AFR tables now, it just runs off the fuel table

I bought another sensor immediately but have fitted NB to avoid the problem

Vast majority of off roaders don't use EGO at all

I tune to 14.7 on cruise so I can at least do that on NB

zen · May 1, 2014

unlocked gems ecu 4.6..fitted with kodar becm emmulator..ie dont need becm..£100

going ms...waiting for delivery..

well its out and now in!!

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