Maverick1975

I would definately be interested in a hood like this for my BS, just form aesthetic benefits alone. Please let me know if it could be produced for sale? VERY interested

hhughes1

I will have a vented hood on my car while at Sebring next week. The last time I was there was in August and I had issues with the oil temp exceeding 280 and of course limp mode enabled. The ambiant air temps are going to be much cooler at a February event but it will still be interesting to see how much cooler the car runs.

Jeff M

Just a quick mention, the hood liner material is yet another thing we often don't hear about with the way MB builds so much into these cars and we don't know to appreciated it; the liner will release a fire retardant if there is an engine fire. Service guys showed me something about it, and said sometimes customer paint theirs to cover over the salt splash blems (here in cold snowy Minnesota) and he tells customers now to avoid doing this ahead of time. No I did not hear anyone talk about painting their liner here, just thought it interesting while talking about hoods and such.

wonsuk_utmb

The hood is being shipped. Photos are pretty bad. From these I wish the vent edges were not as pronounced. Will have to reserve full judgement until it is on the car painted. Last photo does not show vent mesh that is present.

Maverick1975

This looks very promising, please let us all know about fitment ! Well done Won!

AMS Performance

If you truly want to lower your engine bay heat by 50% or more the only real way is to ceramic coat the stock manifolds (both inside & outside preferably). This will drastically reduce engine bay heat thereby improving stock cooling and lowering both oil & coolant temps. It will also allow the stock radiator to function better as well.

The only possible drawback to this is your stock primary cats will get significantly hotter now that all the heat is being channeled directly into the cats instead of being dissipated into the engine bay as it naturally would. Whether or not this shortens the life of the primary cats its hard to tell, but they could get close to their threshhold.

Until you address the main source of the heat (stock manifolds), trying to "cure" the heat through indirect band-aid measures really isn't going to do much at all.

Ceramic coating is on avg about $250-350 per set of V8 headers and is worth every penny when it comes to heat reduction. If anyone needs a stock set of manifolds I may have a pair lying around here somewhere. (Obviously if you want to ceramic coat your aftermarket headers that is also another possibility).

wonsuk_utmb

The purpose of the hood is mainly aesthetics with a secondary purpose of venting heat. I just posted it under this topic because it was applicable, and the OP had mentioned that he had considered a vented hood.

LZH

thanks for posting - the hood looks really good - can't wait to see pics with it installed. You ARE planning on painting it, right ?
IMO, ceramic coating the exhaust manifolds is a great idea - I'm gonna do that. But I'm still convinced that opening up the underside of the hood below the OEM hood cowling/vent will dissipate a TON of heat that gets trapped at the back of the motor and has nowhere to go.

wonsuk_utmb

I'll test fit it prior to taking it to an auto body shop, and then take some pics before and after the paint.

RBYCC

Typically the cowl is an area of positive pressure.
It will only vent heat when the car is at a stop.
In motion the pressure rises and will force air into the cowl vent..
Much like the "cowl induction" on many muscle cars.

Best place to extract engine bay heat is with vents from the negative pressure front to mid section of the hood.or fender

LZH

So then do you think in my OP the picture of the underside of the hood where it shows very obvious scorching....is from underhood temps at a standstill?? I hear what your saying....but with enough airflow at the grill it has to go somewhere ?

RBYCC

Read my post again...
Not questioning your "scorching", just stating the obvious..
The cowl area is always a high pressure area due to the effect of the windscreen.
That is why the cowl area for so many years is used as the supply air for the interior heating/cooling systems.

In motion there is no extraction as air is forced into the engine bay...
You extract heat from a low pressure area on the hood, which usually is from the leading edge to about three quarters up.
Easy to discover your high and low pressure areas...
Tape lengths of yarn to your hood and see if they rise up or are pressed against the hood.

The cowl area is a great location for an ambient air induction for engines running carbs, not much help for FI systems.
Bringing ambient air from the cowl creates turbulence and won't reduce engine bay temps as there is no exhaust/extraction.

Look at any modified turbo car and you will see where the extractors reside..
Never in the cowl area.

Below is a pic of the heat extractors on my C124 M103 TT.
In essence stamped louvers installed upside down and backwards.
Very similar to some of the aftermarket BMW hoods.
Engine bay temps with a TT install run as hot if not hotter then the BS.

wonsuk_utmb

Installation not going as well as hoped. The body shop is going to need to make some modifications for the hood to fit. From the pics, the front of the hood is lifted and the shop is trying to find a way of making the hood sit right. Damn, it would have been perfect to me.



Sorry pics were taken with an iphone. Also hood emblem has not been installed yet.

RBYCC

Is the hood warped?
Front gaps aren't typical...
Normal adjustment usually only establishes the fender to hood line.
From your pic even if you closed the gap at the grille area the gap above the lights probably won't pull down enough..

Maverick1975

That's a tough break Won. Had so much potential. I guess that means the mold that Carl made is now a complete write-off given that the hood it yielded doesn't fit without major work. Bummer!!

GeoGeo

Yeah too bad the fitment needs to be worked out....on the plus side I thought the vents looked a bit too "ricey" but turned out to be alright.

Hope you get it worked out.

RBYCC

Also surprised a test fit wasn't done prior to painting...

wonsuk_utmb

Yeah that was my mistake. I was just trying to save time. What a waste of money. Today they are planning on starting the modification, but i'll probably tell them to hold off unless all they need to do is modify the hood and hood hardware.

On the brightside, I think I located the autobody shop I'll be taking all my stuff to.

RBYCC

Not sure what a body shop can do if it is warped.
If it is warped you may try to salvage it.
Possibly Dzus 1/4 turn fasteners can be used to pull down the leading edge?
Dzus has a line of small fasteners that come in several anodized colors.
The Dzus fasteners have been used for many years on race car panels that need to easily be removed, including lift off hoods.

Ed A.

GeoGeo

Sorry things aren't working out...on a side note, how's the carbon fiber weave on the hood and the overall quality (besides not fitting ) I've been trying to get a OEM CF hood for the BS (no vents), since there's potential for quite a bit weight savings.

Evosport was in the process of getting one made but with everything that's going on I don't think that's gonna happen...

wonsuk_utmb

I'm going to live with this vented hood installed for some time. In the meantime, I am sending my hood to china. The mold was made for this hood using a hood that was reconditioned from an accident (biggest mistake). For everyone, the hood is not warped, it was made from a bad starting point.

wonsuk_utmb

It's definitely lighter probably by about 20 lbs or so, I'll have the exact weights some time later. The carbon weave was actually quite good.

wonsuk_utmb

Now my body shop is doing some minor mods to make this hood fit. It'll probably be a one off. Will post pics when ready.

wonsuk_utmb

Jorge @ Houston Euro Collision is unbelievable. I'm pretty pleased with how it came out. Driving, you have absolutely no flapping or noteable increase in windnoise, although I have yet to get on the highway. Also it might be my imagination but the front end seems a little more responsive. Although that might be the "running faster with new shoes" syndrome.

GHAZAN

looks good...how are the oil temps?