4.6 Bosch cam, search anxiety

My6speedz

My6speedz

Well-known member
Feb 15, 2015
134
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robertf said:
the dish is 10cc different. im not going to hold your hand through calculating a compression ratio, but it is what it is wether you buy it or not
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For one dynamic calculators are very hit or miss. Two i'm guessing you have never measured it yourself, ie: poured your cylinder heads and actually worked it out on a cam doctor card versus the manufactures card?. Three dynamic compression is half snake water itself, how can you measure something down to one given value when it is dynamic in nature?

Dynamic compression was the be all end all some tuner started pounding his chest about two years ago. The only thing it is really useful for is figuring out your compression limit on pump gas.

What you are failing to see is that piston dished would have NO effect what you are are posting. How would IVC and EVO that cross more suddenly start magically making more power once a dish is added to the piston?

I can see that your "calculated" figures are bullshit because the increasing dynamic ratios do not tread with the overlap values.
 
KyleT

KyleT

Well-known member
Mar 28, 2007
6,059
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Fort Worth, TEXAS
Don't get your question.

The s/c is for a bosch d2, the headers are for a rv8, the l322 is for when you figure out that discos and rv8's suck and just want a nice powerful fast reliable SUV...
 
My6speedz

My6speedz

Well-known member
Feb 15, 2015
134
1
NC
KyleT said:
Don't get your question.

The s/c is for a bosch d2, the headers are for a rv8, the l322 is for when you figure out that discos and rv8's suck and just want a nice powerful fast reliable SUV...
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Ok then well if that is the case, then I don't see the point in your post.

How do you tune it to take advantage of the blower?
The picture of the RR made me think it was for the RR.
 
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KyleT

KyleT

Well-known member
Mar 28, 2007
6,059
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Fort Worth, TEXAS
I never installed it. But I would use mega squirt, or since I have to stay obd2 legal, use a greddy emanage ultimate piggy back. It worked flawlessly on my s/c, then turbo'd miata and I never had an issue passing inspection.

Land Rover or rather Cameron used the split second add on injector. I assume it worked because that's what they planned on selling with the "extra boost" Kit that runs 8psi. To run 5 psi they said you don't need fueling. And that came from a LRNA engineer.

5psi was supposed to be around 265hp on a 4.0 and 8lb boost was supposed to be 285-290. On a 4.6 add 25-30hp. According to the lr guy. And the bosch didn't have the issues like the gems with uneven fueling, or so they say. This kit came from a test truck that Cameron had in California under the SVO name while developing it with Land Rover or something. It is a custom snout eaton M90 and has pretty crude sand cast parts and pieces. Quality but definatly not production. The p38 version made production though. I drove one and It had way more power than I expected and the guy said he dyno'd at like 270whp.

I had it listed on here for sale but kinda forgot about it.

I never put it on because I did my axle swap then life got busy.
 
R

robertf

Well-known member
Jan 22, 2006
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My6speedz said:
I can see that your "calculated" figures are bullshit because the increasing dynamic ratios do not tread with the overlap values.
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because it is assumed the cam is installed straight up and is affected by any advance the mfg builds in. if i didnt make this assumption then the expansion ratio values would be worthless. if you were as good as you think you are you would have caught that
 
My6speedz

My6speedz

Well-known member
Feb 15, 2015
134
1
NC
robertf said:
because it is assumed the cam is installed straight up and is affected by any advance the mfg builds in. if i didnt make this assumption then the expansion ratio values would be worthless. if you were as good as you think you are you would have caught that
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that was nonsense, congratulations :applause:
 
F

FB111

Well-known member
Jun 7, 2004
475
0
D Chapman said:
Lol. So ported and polished heads make no power gains and make the rover engine run like shit.

Got it.
Click to expand...

I think you were given a pass on a poor choice of words in your earlier post. "hogged out" I would think a properly ported head would help but the Rover head is such a shitty old design.
 
D Chapman

D Chapman

1
Jan 3, 2005
11,746
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On Kennith's private island
The heads and intake are very restrictive. Of course I do not believe you can unleash 35hp by just hogging them out, but it does help. I would not say they're a shitty head, but they could be improved upon.
 
B

bukowski

Member
Jun 25, 2014
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dallas
someone seriously saying that p&p work will not benefit these? crazy talk...port and polish will increase performance in a lawn mower engine. you free up flow and remove dead end pockets from port to port.....should be the goal at factory.
 
F

FB111

Well-known member
Jun 7, 2004
475
0
For starters the valves are in the wrong place, they should be centered in the bore and in the combustion chamber so that the valves aren't shrouded. And there isn't a squish area in the combustion chamber. How many all aluminum engines today run a 9.5 to one combustion ratio?
 
My6speedz

My6speedz

Well-known member
Feb 15, 2015
134
1
NC
D Chapman said:
Lol. So ported and polished heads make no power gains and make the rover engine run like shit.

Got it.
Click to expand...

So tell me if you port a head and make it flow better but don't add fuel for all that new massive super air flow coming into the engine or enhance the valve timing what are you really gaining?

It is also true that slapping a really heavily worked set of heads on a small engine with a small cam that you're not changing the tune on will make it run like shit.

You guys act like you know so much, yet can't understand a comment that deals with something that is actually very basic...

Whats so hard to understand about that?
 
R

robertf

Well-known member
Jan 22, 2006
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366
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My6speedz said:
So tell me if you port a head and make it flow better but don't add fuel for all that new massive super air flow coming into the engine or enhance the valve timing what are you really gaining?
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Google how a closed loop mass air flow efi system works. It was probably in the January 92 issue of super chevy if your jitterbug won't do google.
 
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