{"id":42020,"date":"2015-09-08T00:00:13","date_gmt":"2015-09-08T00:00:13","guid":{"rendered":"https:\/\/namgar.com\/NAMGAR2020\/?p=42020"},"modified":"2015-09-08T00:00:13","modified_gmt":"2015-09-08T00:00:13","slug":"are-your-curtains-drapes-closed","status":"publish","type":"post","link":"https:\/\/namgar.com\/NAMGARMAIN\/are-your-curtains-drapes-closed\/","title":{"rendered":"Are Your Curtains (Drapes) Closed?"},"content":{"rendered":"

\"Are(Thanks to John Mackenzie of the South African MG Club for this heading).<\/p>\n

Does your MGA run hot? That\u2019s like asking, \u201cDoes the Pope wear a big hat?\u201d Maybe you have a new repro grill fitted to your MGA.<\/p>\n

These new grills are different in shape from the original grills. In this article we try to make a comparison of the two slatted pieces. The two grills have the same number of vertical slats \u2013 28 on each.<\/p>\n

\"Original<\/p>\n

\"Repro
Repro Grill<\/figcaption><\/figure>\n

The first thing you notice is the difference in weight \u2013 the repro grill weighs about 1 lb 4 oz (600 grams), while the original grill weighs about 2 lbs 4 oz (1000 grams). Most of the weight difference is contributed by the upper and lower rails \u2013 on the repro grill these are aluminum (aluminium), while those of the original grill are made of steel. But the vertical slats on the original are polished stainless steel, while the slats on the repro grill are chromed on brass. This also contributes to making the original heavier.<\/p>\n

\"Original
Original Slats<\/figcaption><\/figure>\n
\"Repro
Repro Slats<\/figcaption><\/figure>\n

The most significant difference is in the shape of the vertical slats. On the original grill, the slats measure \u00bd\u201d (12.7mm) overall width. On the repro grill they are a 1\/16\u201d (1.2mm) wider.<\/p>\n

The width difference can be clearly seen in the photos here, but there is an explanation why they look different. On the original slats, the leading edge has been formed so that it is bent at 110 degrees, i.e. tucked in slightly. On the repro grill, the leading edge is only 90 degrees, thereby presenting a larger surface to the incoming air.<\/p>\n

\"Original
Original Slats Edge Turned 110 Degrees<\/figcaption><\/figure>\n
\"Repro
Repro Slats Edge Turned 90 Degrees<\/figcaption><\/figure>\n

The last difference that can be seen is the angle of orientation of the slats. On the original grill, the slats are \u201cturned\u201d significantly more than on the repro grill. This results in a larger gap between the slats \u2013 about 5\/16ths of an inch (8mm) on average, compared to 7\/32nds of an inch (5.6mm) on the repro grill.<\/p>\n

This difference alone, if my calculations are correct, gives a whopping 40% increase in flow area to the original grill over 28 gaps. Hence the fact that \u201cthe curtains are closed\u201d on the repro grills. This can most clearly be seen if you compare the views of the back of the grills.<\/p>\n

\"Original
Original Grill From the Rear<\/figcaption><\/figure>\n
\"Repro
Repro Grill From the Rear<\/figcaption><\/figure>\n

Original Grill From the RearRepro Grill From the Rear<\/p>\n","protected":false},"excerpt":{"rendered":"

(Thanks to John Mackenzie of the South African MG Club for this heading). Does your<\/p>\n","protected":false},"author":1,"featured_media":44318,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[14],"tags":[],"class_list":["post-42020","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-featured-tech-sessions"],"_links":{"self":[{"href":"https:\/\/namgar.com\/NAMGARMAIN\/wp-json\/wp\/v2\/posts\/42020","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/namgar.com\/NAMGARMAIN\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/namgar.com\/NAMGARMAIN\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/namgar.com\/NAMGARMAIN\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/namgar.com\/NAMGARMAIN\/wp-json\/wp\/v2\/comments?post=42020"}],"version-history":[{"count":0,"href":"https:\/\/namgar.com\/NAMGARMAIN\/wp-json\/wp\/v2\/posts\/42020\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/namgar.com\/NAMGARMAIN\/wp-json\/"}],"wp:attachment":[{"href":"https:\/\/namgar.com\/NAMGARMAIN\/wp-json\/wp\/v2\/media?parent=42020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/namgar.com\/NAMGARMAIN\/wp-json\/wp\/v2\/categories?post=42020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/namgar.com\/NAMGARMAIN\/wp-json\/wp\/v2\/tags?post=42020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}