We look at what's inside a McLaren V8 head
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- เผยแพร่เมื่อ 30 ก.ย. 2024
- We've got ourselves two McLaren V8 heads, along with a whole bunch of other engine goodies, from turbos to ancillaries. In this video, we take a look at the differences in the two heads and look at the potential for making them more efficient, so we can make more power!
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Not as impressive as I thought it would be....
I agree. Basically motorcycle like technology, nothing out of this world.
@@rafaellastracom6411 I agree, I thought it would reveal new secrets, you know, "Koenigsegg - like" type of stuff....
That honestly doesn't even look like a high performance head to me
The ports he discussed are Exhaust Air Injection. It’s been around since mid 1990s on bike engines.
Secondary air is the term for combustion mixing air. Primary air is mixed with fuel then secondary added to control combustion quality.
Check out any gas burner.
Secondary air is just what the tech said. It was used in the late 60 on American cars.
‘Secondary air’ also keeps the Oxygen sensor clean during rich start-up snd warms it to its operating temperature.
Looked an interesting video but I couldn’t stand the focus shifting. Fix that and I’d subscribe
O.M.G. the "Camera-work" Was Terrible ¡¡¡¡
I DLC coated my lifter buckets and have over 250lbs of open spring pressure! Head is dead quiet, its wonderful.
You guys have a very detailed videos on engines. Like others said this is very informative stuff you are creating 👍👍👍. On another note these mclaren engines are based on an old nissan VRH engine from the r390 Le Mans car I hope you can peek in an old inline 4 nissan engine whether the SR20s or the KA24s and you may find some similarities between them.
Another very informative video! In reference to you blueprinting your own camshafts I'm sure you're familiar with Tribology. Correct me if I'm wrong but from my limited understanding the best material for a camshaft is cast iron chill cooled with a high molybdenum/silica content basically spheroidal graphite. On another note I'm wondering what engine management and particular specs Garage 59 are using in their GT4 V8's? Cheers mate
Plastic cam covers.. I appreciate they’re light and cheap to produce, but in such a car it’s sad to see.
That was super informative video,top quality
Thank you!
Pretty much ' plain jane, no last name cyl heads .... no need to worry about IN / EX val head ratio ...I've seen one extreme to the other, cam timing takes care of that if necessary. having finger followers allows for higher valve velocity than flat follower., and IN port dimensions from the val head diameter /throat / port runner diameters are critical .... I bet when your on the flow bench, there will be almost NO increase in flow after 0.370 " / 9.25 mm lift
I have been doing machine work for 40 yrs. this shit ain't rocket science
Agreed....hence the videos to show others it isn’t!
I wonder how much of these engines are Mclaren and how much is still Nissan.
I dont know if anything was "Nissan" to begin with. I think the whole thing is JWT developed. Afaik Nissan bought/leased the engines from Jwt for the r390 project and you can still buy brand new engines from JWT.
The nissan r390 chassis is somewhat related to the jaguar xjr imsa nonsense all coming out of the JWT house. The "Nissan" V8 is really loosely based on the production Vk or Vh engines with nothing really interchangeable and it having more in common with the Infinity IRL V8 engine.
Those Virgin ports are a bloody joke for what is regarded as a performance engine Marque, properly worked over that head and it's mate could make some serious Gains in the performance as you said. Question ? would there be any real benefit in eyebrowing the edge of the chamber to accommodate larger exhaust valves, or do you feel that the turbulence created in the Ex port may actually hinder outflow.
Somewhat similar to 5.0 coyote heads except they use hydraulic lash adjusters, roller rockers, and a somewhat wider valve angle. The coyote, imo, has a better combustion chamber design, with much more quench.
Looks like a nissan head. Oh wait
The dual injector heads are from the 4.0L variant of the McLaren engine. The water pump in the other video is a very early variant. Strange collection of parts
Good eyes, exactly right.
Coming from a motorcycle background, I like that it has a good ol' shim. At least it's 4-valve and not 5 valve like older yamahas! Question when servicing, if a shim needs replacing to adjust the valve clearance, does the cam have to come out or is there enough room to move the rocker and get the shim out?
No it’s a bucket shim that sits over the tip of the valve so I can’t see how you will get it out. Tbh it’s that tight on some of them it will be engine out regardless.
@@REPerformanceUK For other engines Ive seen special tools that can push the valve down with the cam installed to switch out the shims. Basically a special valve spring compressor.
3:18 So the McLaren does not use rollers for the cam to ride on?
I’m a big mclaren fan and own a 720s. How could Ricardo ship something such nasty casting and weak rods out of the box? I love how the car feels at almost 900hp but you have to be so careful with torque… a tall order on twin, twin scroll smaller turbos lol
Ummmm....Mclaren doesn't make its own engines.....they never have.
Cool little video on V8 cylinder heads love watching your channel.... Is epic....👍
Thank you!!
You didn’t mention the coolest part of these
unlike conventional solid lifter, this “lever” shim clearance never need a service
the new chevy used this F1 tech on their new corvette engine
Just found you the last few days. Brilliant videos 👏🏻👏🏻👏🏻
Thank you!
Constant moving of the camera was distracting.
Interesting they have not gone to Conical springs!
I want to run a larger retainer, not a smaller one. I also don’t have coil bind limitations. They are normally the 2 reasons you would run conical or beehive.
Never got a good look at the valve springs except for the one that was held up as an example. Surely there are two springs, or three, on each valve? I assume high rpm engines require multiple springs due to spring harmonics.
I would tend to agree.... But we are starting to see a newer wave of material science technology creeping in to the automotive scene that's pretty amazing!
There are new beehive springs with oval cross section wire that are proving to be just as good. Not to mention these engines spin high but not that high.
More than one spring per valve is very rare! Twin and triple springs are normally for super high power cars that need the seat pressure (drag engine etc).
By looking whats inside a McLaren v8 head you meant looking inside a Nissan VRH35L head right?
I said that, because all current McLaren V8 engines are based on the Nissan VRH35L engine (Nissan R390) the bought the engineering rights to it in the mid 00's
The design of this head is incredibly compact and well thought out !
For the price, they should be
Just like 2019 head on zx10r
great video but sort your focus out on the camera
Its just basic stuff we did to Cossie heads....in the 80's LOL.
Some close ups would be nice can't see much
Those valve angles look super shallow. Presume Grainger & Worral do the castings?
They are shallow as stock, few things to change!
Let’s talk about head😂
How much does a new head cost?
As the saying goes if your asking about the cost " π "
Do a complete engine build and what type or grade are the alloys used in various parts,especially moving parts which are coated with anti friction coating and hi temp coatings and also how much real balancing is done when building a V8 or V10 lambo engine and which parts are balanced and where the material is removed to make sure each moving part is perfectly as can get in weight and moving balanced etc.:) Love a upload about that?
Flowing ports doesnt have as much as an impact if a blown motor compared to NA?
Not as critical as boost can hide a lot, but we look for efficiency everywhere!!
Port flow on boosted engines matters as much as it does on NA engines in the sense that the poor flowing heads wont make as much power at the same boost level as the better flowing heads will. The other way to look at it is it takes more boost to hit the same power level with the poor flowing heads as the one with head work does. It is easier to simply crank the boost up on the poorer flowing heads though and not do any head work though.
I got sea sick
How do mclaren engine revs so fast??? I'm been dying to know about this for ages.
Short stroke/low rotating mass
@@OleHenrikKvammen so low compression and lightweight internals?
Flat plane crank?
@@beerustheblack2846 oh yes I forgot about that too. Sorryyy. Just wondering how can I make my inline 5 rev fast.
Interesting
Did you ever Flow test these heads after? I'm curious what gains could be had from profiling the ports??
I have flow tested the original heads but not started work on porting yet!. Once I have ported the heads I’ll test them again and compare. Cheers Ricky
Exhaust ports very similar to the exaust ports on the 2002> TRIUMPH Daytona 955i which was engineered by Cosworth...very interesting...finger followers akin to those on the latter MY ZX10s.... a lot of this engineering is traded motorcycle to car, car to motorcycle ..very cool
Very basic design with plenty of moving parts to go wrong.
The magic is in the rotating assembly
👍🏼👍🏼
Its called a cam follower
Not a cam leader? 😂
Why would be the reason for rockers on this geometry where the cam sits right atop the valve? Does it add a motion ratio, or allows a steeper valve angle?
Compared to conventional rockers or bucket lifters the finger follower type rockers add less mass that the valve springs need to close allowing higher engine speeds to be reached before the onset of valve float and/or allowing the use of lighter duty valve springs resulting in lower parasitic losses which should allow higher efficiency.
Can this coating be applied on to the piston skirts where the other coating goes. But im assuming this coating is far superior than the usual piston coating.
DLC I don’t think can be applied to aluminum. But it frankly wouldn’t be worth it. You want the surface of the piston skirt to be soft, not hard. That way if it rocks excessively and the skirt rubs the wall you don’t damage the sealing surface of the cylinder wall. So those coatings are designed to give way and be slippery. If you use dlc you’ll shave off the walls at best and at worst catastrophic damage due to the shavings running through the bottom end. DLC is very expensive. It’s used on piston pins, crank throws, rockers, valves. High pressure wear areas that are not direct sealing. The ring to cylinder wall mating is critical to maintain correctly
Not DLC but there are other anti friction coatings we use on piston skirts to reduce friction!
This is the best guy u have to explain the differences with the cylinder heads??
Looking forward to more on these engines. 😎
Thank you!
Not a big fan of this engine... not really engineered for longevity! No thanks!
Stop mucking about copying them you need the mso engine. Or at least a P12. They don't bother porting the cheap ones 🤣