I built my own system on my 1977 Esprit S1. The left side of the engine cover has a 4 inch pipe on the side going to the back of the inside behind license plate . There there is a bilge fan and all the engine heat exhausts around the license plate.?
On Thu., Jan. 2, 2025, 7:23 a.m. Bill Galbraith via , <Lotus=
[email protected]> wrote:
No engine bay blower on the S1, only on the S2. For temperate climates, the right-side rear-quarter window ¡°ear¡± has trunking (#1 in parts manual diagram BEB). For high ambient temperature climates, there is a blower motor under the right-side rear-quarter window, where the battery is on the early S1 cars. There is a thermostat (#14) mounted on top of the air box that completes the circuit to ground to activate the fan motor.
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The parts manual doesn¡¯t break out Domestic, Federal, or ROW markets for temperate or high ambient temperature. I don¡¯t know if this was an option when the car was ordered, or if just some cars got it, some didn¡¯t.
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For the S1, I¡¯ve seen various methods to implement an engine bay blower, sometimes cutting into the engine cover. A cleaner method might just provide a blower, such as for an inboard engine boat, mounted below the engine bay flooring, just to move some air around. Heat rises, so anything to move some cooler air up under the engine cover would probably be beneficial.
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Just my $0.87 worth ($0.02 adjusted for inflation)
Bill
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I have an engine bay blower in the engine bay behind the license plate .I exhaust through and around the license plate. ? is this blower stock or was it put there . If not please explain where exactly this Esprit S1 blower was installed originally thanks?
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On Wed., Jan. 1, 2025, 9:39 p.m. Bill Galbraith via , <Lotus=[email protected]> wrote:
Hay, I just found out something. (I¡¯ve been a Lotus owner for 35 years). Not all cars have the engine bay blower, only the high ambient temperature climates.
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So, if you live in one of those areas and your car doesn¡¯t have the bay blower, you might consider it.
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Bill
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P.
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I did the calculations of the effects of running without the correct airbox, instead just using K&N filters or similar on the carbs, sucking in hot air from the engine bay. The results were pretty amazing. Lots of horsepower lost. You can find that paper on my web site:??
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I can¡¯t measure the temperature under the engine cover of a standard car, as I¡¯ve done many things to my car to reduce the temperature. I¡¯ve had the header Jet-Hot (ceramic) coated and I wrapped the exhaust all the way to the muffler in header tape. That made a HUGE difference of the temperature near the left rear wheel well. I also have the proper engine bay blower, but an adjustable thermostat set really low (140 deg F I think). I¡¯ll try to measure it the next time I¡¯m out, although it¡¯s winter in Florida. It will only be 60 deg F on Saturday, instead of 95 deg in the summer.
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Bill
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The carbs were rebuilt by WEBER JETS in Vancouver Canada. EXPENSIVE. But the 2977 Esprit S1 runs like a ROLEX PRESIDENT.
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That Weber spec is interesting to say the least. The original Twincam at 1500cc and 95-100 HP was so equipped, wouldn't think that to be optimal for output on the 907 but it would run like a Swiss watch if the carbs are in good shape.
P.
